首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 31 毫秒
1.
《Journal of plant nutrition》2013,36(10):1747-1756
Abstract

Forage production is influenced by such factors as applied nutrients, water availability, and harvest interval (for perennials). Logistic models have been developed for response to single and multiple elements such as nitrogen (N), phosphorus (P), and potassium (K). This analysis focuses on response of Pensacola bahiagrass (Paspalum notatum Flügge) to applied N, P, and K. The multiple logistic model is shown to describe the data rather well. A step-wise procedure is outlined for parameter evaluation. It appears that the model is relatively free of bias. It is concluded that a factorial design of N × P × K = 3 × 3 × 3 is the minimum number of treatments required for the analysis. Plant nutrient uptake data would also enhance the value of the results.  相似文献   

2.
Abstract

Dry matter yields and plant nutrient uptake of forage grasses are influenced by levels of applied nitrogen (N), phosphorus (P), and potassium (K). Response to one element generally depends on levels of the other two. In this article, a mathematical model is presented which includes the major elements, N, P, and K as inputs. It consists of triple logistic equations with a total of thirteen parameters. The model is evaluated for Kentucky 31 (KY 31) and Kenwell tall fescue (Festuca arundinacea Schreb.) grown at Watkinsville, GA on Cecil sandy loam (clayey, kaolinitic, thermic, Typic Hapludult). Procedures are described for parameter estimation. The model provides high correlation between yields and plant uptake of N, P, and K with applied N, P, and K for both cultivars of tall fescue, as demonstrated in response graphs and scatter diagrams. Intercept and N response coefficients from this study agree closely with those from previous work. Data from this study support the hyperbolic relationship between dry matter yield and plant N uptake predicted by the model. The model is mathematically well‐behaved and is relatively easy to use in practice.  相似文献   

3.
《Journal of plant nutrition》2013,36(12):2321-2341
Abstract

Three field experiments were conducted to investigate the effects of soil‐applied nitrogen (N) on plant chemical composition, nutrient removal, and the use of plant analysis to assess N status of Australian waxflowers. Experiments were conducted in commercial plantings of Chamelaucium uncinatum cultivar Alba and a Chamelaucium hybrid (C. floriferum × C. uncinatum) known locally as Walpole wax, at 3 sites in South Australia. Nitrogen, as ammonium nitrate, was applied at rates up to 160 g plant?1 over several side dressings during the growing season. To assess plant nutrient status, stem tips (25–40 mm long tips of stems) were sampled during the growing season and whole stems at harvest.

Nitrogen concentration in both stem tips and whole stems was sensitive to variations in N supply; however, the magnitude of the effect varied between sampling times and sites. In stem tips sampled during spring, the increase in N concentrations ranged from 19.8% at site 2 to 74.6% at site 1. Nitrogen concentrations in stem tips were consistently greater than concentrations in whole stems. The application of N decreased phosphorus (P) concentrations in whole stems and copper (Cu) concentrations in stem tips and whole stems. There was no consistent effect of applied N on potassium (K), calcium (Ca), magnesium (Mg), boron (B), zinc (Zn), and manganese (Mn) concentrations in either plant part sampled. Nutrient removal by flowering stems, in order from greatest to least, was N > K > Ca > P > Mg > Mn > B > Zn > Cu.

Based on 1800 plants ha?1, it was estimated that for N, P, and K, 121.9, 15.4, 60.1 kg ha?1, respectively, was removed in harvested stems. Based on poor sensitivity, the lack of a sharp transition zone between deficient and adequate N concentrations and the lack of consistent relationships between N concentration in stem tips and yield response, it is concluded that N concentration in stem tips is not a useful indicator of the N status of waxflower plants.  相似文献   

4.
Abstract

Pearl millet is a potential dryland crop for Nebraska. Experiments were conducted in eastern Nebraska in 2000, 2001, and 2002, and in western Nebraska in 2000 and 2001. The objectives were to determine optimum nitrogen (N) rate, N uptake, and N use efficiency (NUE) for pearl millet. The hybrids “68×086R” and “293A×086R” and N rates of 0, 45, 90, and 135 kg N ha?1 were used. Hybrids had similar yield, N uptake and NUE responses. In western Nebraska in 2000, pearl millet yield response to N rate was linear, but the yield increase was only 354 kg ha?1 to application of 135 kg N ha?1. In eastern Nebraska, pearl millet response to N rate was quadratic with maximum grain yields of 4040 in 2001 and 4890 kg ha?1 in 2002 attained with 90 kg N ha?1. The optimum N rate for pearl millet was 90 kg N ha?1 for eastern Nebraska. For western Nebraska, drought may often limit pearl millet's response to N fertilizer.  相似文献   

5.
Maize (Zea mays L.) growth and yield are most sensitive to variations in plant density and nitrogen (N) in north-western Pakistan. This study was conducted on the Agricultural Research Farm of NWFP (North West Frontier Province) Agricultural University, Peshawar, from 2002–2004 to establish an accurate plant density and N management system aimed at high yield of maize. The 2 × 3 × 6 factorial experiment was designed having two plant densities (P1 = 60,000 and P2 = 100,000 plants ha?1) and three nitrogen rates (N1 = 60, N2 = 120 and N3 = 180 kg N ha?1) applied to the main plots, while six split application for N in different proportions were applied to subplots at different growth stages of maize in two equal (S1), three equal (S2), three unequal (S3), four equal (S4), five equal (S5) and five unequal splits (S6) at sowing and with 1st, 2nd, 3rd and 4th irrigation at two-week intervals. Growth rate and yield increased with elevated dose and number of N split applications. Improved endurance to high stands allowed maize to intercept and use solar radiation more efficiently, contributing to the remarkable increase in the crop growth rate and yield.  相似文献   

6.
The grasslands of the Appalachian region spread over undulating terrain with high annual precipitation rate which causes a large variation in soil and nutrient factors like water potential (WP), pH, nitrogen (N) and phosphorus (P) levels. There is a need to understand these factors and their interactive effects to design precise agronomic practices for acidic grasslands to maximize production. A pot experiment was conducted with an objective to quantify the effects of WP, pH, N and P rates on herbage accumulation and nutrient recovery of Kentucky bluegrass (Poa pratensis L.) cropping system. Centrally rotatable composite design was applied to study the effects of two levels of WP and five levels each of pH, N, and P fertilizer additions in order to optimize bluegrass herbage mass (yield). WP, pH, and N were significant main effects, as were the interactions WP × pH, WP × N, and pH × N. The yield response function was derived from these four factors. The order of importance for these model parameters based on their effect on herbage accumulation was WP > N > WP × pH > pH >WP × N > pH × N. The optimum levels of WP, soil pH, N, and P rates were predicted for Kentucky bluegrass by using the response surface yield model of this pot study i.e., WP of ?422 kPa to ?166 kPa, 5.5–6.1 soil pH, 50–68 N mg kg?1, 36–40 P mg kg?1. Concentration (%) of nutrients like N, P, potassium (K), calcium (Ca), and magnesium (Mg) were determined to study the impact of WP, pH, N, and P factors and their interactions on plant nutrient recovery. Main effects like WP, pH, and N levels had significant influence on N and P concentration in plant tissue. K, Ca, and Mg concentrations in plant tissue were significantly affected by WP, pH and their interaction. The results of this greenhouse study imply the necessity to incorporate the information about the variation of soil and nutrient factors in designing precise agronomic practices to low productive acid reclaimed grasslands with undulating topography and high annual precipitation rate.  相似文献   

7.
Abstract

The logistic model has been used extensively to describe crop response to applied nutrients and water availability. It contains three parameters that can be estimated from data by regression analysis. One of the parameters refers to the reference state of the system, either at zero applied nitrogen (N) or applied N to reach 50% of maximum yield (N 1/2). A negative value of N 1/2 indicates that the soil already contains more than enough N to reach 50% of maximum yield. In the present analysis, data from a field study at Watkinsville, Georgia, which measured response of corn [Zea mays (L.) Pers.] to applied N following plowunder of grass sod is used to verify this point. It was found that N 1/2 shifted from –50 kg ha?1 in the first year to +25 kg ha?1 after several years. Availability of N from decaying vegetation declined exponentially with time. The time constant for decomposition and nitrification was 2 years. Total amount of N released from the vegetation was estimated as 190 kg ha?1.  相似文献   

8.
Abstract

We studied the response curves of Dactylis glomerata to addition of nitrogen (N), potassium (K), and lime in presence of a range of added phosphorus (P) on an acid xeric heath soil (pH 4.3) of Tierra del Fuego (Argentina). The heath community developed on the soil has dominated by a 50% of cover of an evergreen dwarf shrub (Empetrum rubrum) of very little forage value. Addition of P alone or combined with any of amendments increased significantly the growth of Dactylis. In contrast, absence of P, even supplying 50 ppm of N or K, no increase in growth of Dactylis was detected. This suggested that P was the most important nutrient limiting the growth of forage plants in this heath soil. By fitting response curves, we studied three different aspects: the maximum and the minimum yield approached, and the slope of the response curve to reach the maximum yield. Increasing added P, the maximum yield reached was greatest for N addition, lowest for lime, and intermediate for K and P alone. The minimum yield (absence of added P) did not differ among treatments. Consequently, all response curves were fitted using a common value for the intercept. In addition, liming the soil in presence of added P decreased the slope of the response curve to reach maximum yield. This was mostly ascribed to a decrease of the effectiveness of added P by sorption of P onto the surface of lime applied.  相似文献   

9.
《Journal of plant nutrition》2013,36(7):1183-1197
Abstract

Nitrogen (N) fertilization continues to be of primary importance in the economically successful production of cotton (Gossypium hirsutum L.). Profit margins of producers might be expanded by increasing the uptake efficiency of applied N. Recently, N fertilization of crops grown in the Mississippi River Delta has been suspected to impact water quality in the Gulf of Mexico. Improving efficiency of N uptake could alleviate some environmental concerns by increasing the retention of N at the site of application. The objective of this study was to determine the impact of replacing preplant N applications with postemergent N applications on the growth and yield characteristics of cotton. Delayed applications of the recommended rate of N fertilizer (112 kg N ha?1) were tested for four years under irrigated and dry land production conditions. The N rate was applied either preplant, after crop emergence, or at first square. Further, 112 kg N ha?1 was split applied evenly at preplant + first square, and after emergence + first square. The five 112 kg ha?1 N treatments were compared to an unfertilized control. Yield tended to be maximized with N treatments that included a first square application. Yields were usually lowest in the unfertilized control and the 112 kg N ha?1 preplant treatments. Not surprisingly, both yield and plant growth was influenced more by irrigation than N fertilization. Years when drought conditions caused water stress and limited plant growth, dry land cotton had only limited response to the N fertilization treatments. Irrigated cotton responded to N treatments all years with increased growth and yield. Optimizing agronomic considerations, the best N fertilization timing was an after emergence + first square split application.

  相似文献   

10.
ABSTRACT

The aim of this research is to assess the effect of the interaction between phosphorus and nitrogen (P × N) in organomineral fertilizer in the nutrition of plants cultivated in a Typic Hapludox. It was used a completely randomized design in a 5 × 5 factorial scheme with four replications. The treatments corresponded to the equivalent of five doses of P (0, 20, 40, 60, and 80 kg ha?1 of P) in interaction with five doses of N (0, 50, 100, 150, and 200 kg ha?1 of N). Three sequential crops of millet were carried out with 40 days of growth each, whose aerial part of the plants was harvested in order to determine the dry biomass and the contents of N and P. After each crop, soil samples were collected from the pot for determination of the forms of P and N. It may be inferred that simultaneous application of N and P into the fertilization does not promote significant changes in the dynamics of N in the soil, but the effect of the interaction is changed over the crop time in the plant. In soil the application of organomineral fertilizers did not show effect of the interaction between P × N on the forms of organic N, inorganic and organic P, except for a difference in the available P, which is the dose of 20P × 200N kg ha?1 with greater efficiency. In the plant, there was interaction between P × N in organomineral fertilizer on the dry biomass of the aerial part of millet from the dose of 20P × 100N, focusing on the dose of 50P × 150N kg ha?1, while the accumulation of P and N starts from the dose of 40P × 100N and 40P × 50N kg ha?1 with an increase (synergy) in both nutrients up to the dose of 80P × 200N kg ha?1.  相似文献   

11.
Nidularium minutum Mez is a terrestrial bromeliad with ornamental potential, especially as a species that develops the shade. This, as well as many other bromeliads, is endangered. We studied the growth of nitrogen (N). N. minutum cultured in vitro in different concentrations of nitrogen (N), phosphorus (P), potassium (K), or calcium (Ca) to develop an ideal growth environment for this plant to preserve the species. Results favorable to the growth were treatments containing 60 mM N, 0.60 and 1.25 mM P, 10 mM K, and 1.5 mM Ca. Based on these results two new culture media were prepared (T1 and T2) and were compared with the MS medium with dilutions of macronutrients (50%, 20%, 10%, and 5%). The results showed that changes in the MS medium favored growth of N. minutum.  相似文献   

12.
In sustainable agriculture, the protection of environment against pollution is the main goal for consumers. Nowadays, the overuse of pesticides and chemical fertilizers, are one of the main causes of environmental pollution. It is claimed that incorporation of organic compound into soil enhances nutrient availability and plant productivity. A greenhouse experiment was conducted to determine the effects of 0%, 1.5% and 3% cattle manure biochar and 0, 300 and 600 mg K-nano chelate kg?1 soil on agronomic properties and nutrient status of Ocimum basilicum L. Biochar increased leaf area and plant height, significantly. Application of 1.5% and 3% biochar increased fresh weight by 40% and 42% and dry weight by 50% and 49%, respectively. Addition of 3% biochar increased P, K and Mn concentrations by 45%, 17% and 109%, respectively. Biochar increased N, P, K, Zn and Mn uptake, significantly. Addition of 300 mg K increased dry weight by 15%; while application of 600 mg K decreased it. Application of 300 and 600 mg K-nano chelate increased K and Zn concentration and K uptake significantly. Furthermore, 300 mg K increased Cu and Zn uptake. In order to achieve sustainable agricultural productions, biochar application is recommended especially in the soils of arid and semiarid regions.  相似文献   

13.
Abstract

This study was designed to explore nitrogen (N) nutrition in bearberry plants (Arctostaphylos uva‐ursi L.) using a hydroponic culture system. Two experiments were performed in which the total N concentration (34, 52, and 73 mg L?1) and N‐NO3 ?:N‐NH4 + ratio (50/50, 60/40, and 70/30 in %) in the nutrient solution were varied and effects on nutrient uptake [N, phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg)] and foliar composition determined. Highest‐quality plants were yielded using a N level of 73 mg L?1 and a N‐NO3 ?:N‐NH4 + ratio of 50/50. Standard nutrient values for foliar tissue were obtained for bearberry plants growing in these hydroponic cultures for their use as preliminary norms in the diagnosis and recommendation integrated system (DRIS). In a subsequent complementary experiment, these norms were used in the DRIS procedure and applied to plants growing in solutions of varying K concentrations. It was found that the DRIS norms established in the hydroponic experiments were able to account for changes in nutrient limiting factors produced in response to the varying K concentrations in the nutrient solution. The results obtained will be useful for the nutritional diagnosis of bearberry plants.  相似文献   

14.
Abstract

A cotton (Gossypium hirsutum)–peanut (Arachis hypogaea L.) rotation is widely practiced in the southern coastal plain following the reemergence of cotton as a major crop in the 1990s. Very few plant nutrition studies have been conducted in the coastal plain (CP) with modern cotton varieties and none with the cotton–peanut rotation. Experiments with varying rates of nitrogen (N), phosphorus (P), and potassium (K) were conducted to determine if the recommendations from soil tests provide adequate nutrition for maximizing profit when yield goals are Georgia state averages, due to other conditions. From 1996 through 1998, N, P, and K experiments were conducted in cotton crops, and P and K experiments were conducted in peanut crops on Tifton loamy sand. Initial Mehlich‐1 P was 2 to 3 mg/kg (“low”) and Mehlich‐1 K was 50 to 64 mg/kg (“medium” for cotton and “high” for peanut). Each crop was grown each year. State average yields of cotton and peanuts were produced. There was no response in cotton yield to N rates from 34 to 136 kg N/ha. Lack of response may have been due to the fact that the field had not been in production for several years prior to 1996 and there was ample soil mineral N. In 1997 and 1998, residual N provided by N fixation by the previous peanut crop appeared to be sufficient. Maximum profit from P fertilization in cotton was attained at 50 kg P/ha, the recommendation from the soil test. However, a University of Georgia Cooperative Extension Service recommendation to double the P rate for new land with a “low” Mehlich‐1 P soil test was not validated. Cotton yield did not respond to K fertilization even though an application of 55 kg K/ha/year was recommended from the soil test. Peanut yield and grade did not respond to either P or K fertilization. The recommendation from the soil test was 40 kg P/ha/year and no K. Estimates of P removal were 11 kg/ha for cotton and 8 mg/ha for peanut crops. Estimates of K removal were 25 kg/ha for cotton and 22 kg/ha for peanut crops. Over 3 years, soil P was not depleted, but soil K was depleted. Approximately 12 kg P/ha were required to raise soil test P 1 mg/kg and 18 kg K/ha were required to raise soil test K 1 mg/kg (49 lb. P2O5 to increase the P test 1 lb./acre, 38 lb. K2O to raise the K test 1 lb./acre). Additional studies are needed, but the current studies suggest that revisions in recommendations are needed for both cotton and peanut crops.  相似文献   

15.
Abstract

The agronomic efficiency of nitrogen (N) fixing and phosphate solubilizing microorganisms and an arbuscular mycorrhizal (AM) fungus on vigour, photosynthetic pigments, seed yield, grain protein and nutrient uptake of greengram plants, were assessed in soils, deficient in phosphorous (P). The tripartite inoculation of Glomus fasciculatum + Bradyrhizobium sp. (vigna) + Bacillus subtilis, significantly increased dry matter, chlorophyll content and nutrient uptake of greengram plants. Generally, the number of nodules formed per plant was more at flowering stage, which decreased at podfill stage of plant growth. Seed yield increased significantly by 27% due to inoculation with Bradyrhizobium sp. (vigna) + B. subtilis + G. fasciculatum, relative to the control. Grain protein ranged from 17% (P. variabile) to 28% (Bradyrhizobium sp. (vigna) + B. subtilis + G. fasciculatum) in inoculated greengram. A negative effect occurred on some of the measured parameters when P. variabile was used alone or in combination treatments. The N and P contents in measured plant parts (e.g., roots, shoots, straw and grain) differed considerably among treatments. The populations of PSM, percentage of root infection and density of the AM fungal spore improved in some of the treatments.  相似文献   

16.
ABSTRACT

Exponential fertilization (EF) can cause seedlings to load more nutrients than they need to grow to establish reserves. Lighting spectrum adjustment may strengthen the growth and nutrient utilization of seedlings, which may modify seedling response to EF. In this study, containerized Prince Rupprecht’s larch (Larix principis-rupprechtii Mayr.) seedlings were cultured in commercial substrates (275.59 mg nitrogen [N] and 60.05 mg phosphorus [P] per plant) and received EF at 0 (control), low (88 mg N and 36 mg P per plant), and high (130 mg N and 54 mg P per plant) doses under continuous lighting for 18 h daily. Two light-emitting diode (LED) spectra with different red (R), green (G), and blue (B) ratios were used as R-tinted (R7BG1) and G + B-tinted (R3BG10) colours. Under the R7BG1 spectrum, seedlings receiving low-dose EF had the best growth in height of 29 cm (P = 0.0100) and root-collar diameter (RCD) of 4.7 mm (P < 0.0001) and the highest N (170 mg plant?1; P < 0.0001) and P contents (154 mg plant?1; P < 0.0001). These seedlings also had the greatest biomass of leaves (P = 0.0005), stems (P = 0.0062), and roots (P = 0.0016) in the high-dose EF treatment. This combined effect resulted in the highest N uptake efficiency of nearly 40%. High-dose EF increased the chlorophyll-a and -b contents, while light spectra modified leaf protein content. Therefore, the LED spectra had an interactive effect with the EF dose on nutrient uptake and utilization in Prince Rupprecht’s larch seedlings with a recommended regime of EF at 88 mg N and 36 mg P per plant under the R7BG1 LED spectrum.  相似文献   

17.
ABSTRACT

Potassium (K) plays several key roles in plant metabolism and crop productivity. Non-exchangeable K (NEK) makes K available in soil and to the crops. Impact of integrated use of organic and inorganic fertilizers on NEK release was studied in an ongoing long-term fertilizer experiment (LTFE) under rice-wheat cropping system. The experimental plots in the field were laid out following a randomized complete block design (RCBD) with eight treatments and three replications. Addition of K increased the release of NEK, but integrated use of manure with fertilizers increased K release of NEK from soils than the use of inorganic K alone. The maximum NEK (102 × 10–2 cmol kg?1 of soil) was released under 100% NPK with Farm Yard Manure (FYM) treatment and the minimum (93.9 × 10–2 cmol kg?1 of soil) under 100% NP-treated soils. Four kinetic models, parabolic diffusion, first order, power function, and Elovich, were tested for characterizing K release data and Elovich model provided the best fit (R2 = 0.96–0.97). Available K status in soils, rice yield, and plant K uptake increased significantly with the increase in NEK release rate. Our research outcomes suggest that the addition of K through integrated fertilization is needed to improve plant nutrition and productivity of the intensive rice-wheat cropping systems.  相似文献   

18.
Abstract

Poorly managed kaolinitic soils are often too low in P and K for optimum agronomic crop production. Even though many of these soils have relatively high phosphate fixing capacities, P applied at sufficient rates to increase soil P to acceptable levels may induce micronutrient deficiencies. The purpose of this study was to evaluate the effects of applied and residual P on Mn, Zn, and Cu uptake by field grown wheat (Triticum aestivum). Treatments were a one‐time application of P (0, 64, 128, 256, and 384 kg/ha P) and K (0, 110, 220, 440, and 660 kg/ha K) rates arranged in a 5×5 complete factorial. The treatments were applied in October, 1977 and the study was continued through June, 1979. Potassium and P × K interactions did not have a significant effect on Mn, Zn, or Cu uptake. Phosphorus did not affect Mn concentration in the wheat tissue but Zn and Cu concentrations generally decreased as applied and residual soil P levels increased. The tissue Zn concentration at the various plant growth stages did not decrease below defined critical levels. The Cu concentration decreased linearly with applied P and curvilinearly with residual P. The tissue Cu levels often decreased below suggested critical levels. Total Cu in the wheat tissue indicated that the decrease in Cu concentration as P levels increased was not a simple dilution effect resulting from increased plant growth as applied and residual soil P increased.  相似文献   

19.
Abstract

The extended logistic model relates seasonal dry matter and plant nutrient uptake to applied nutrient level. It has been shown to apply to data for annuals such as corn (Zea mays L.) and perennials such as bermudagrass (Cynodon dactylon L.) and bahiagrass (Paspalum notatum Flügge). The linear parameters in the model have been shown to depend on water availability and harvest interval (for perennials). Further work is needed to relate model parameters to plant characteristics. In this article, data from a field experiment with corn at six nitrogen levels (0, 0.5, 1.0, 2.0, 3.0, and 5.0 g N plant?1) and three plant population densities (3, 6, and 9 plants m?2; 3, 6, and 9 104 plants ha?1) are used to provide insight into this question. It turns out that all five model parameters are dependent on plant density, approaching maximum values at 8.3 plants m?2. Three of the parameters approach zero as density approaches zero, which seems intuitively correct. It is concluded that lower and upper limits of plant nitrogen concentration are independent of population density and are functions of the particular plant species. Detailed procedures are described for estimation of model parameters.  相似文献   

20.
Abstract

This greenhouse study examined the root characteristics (biomass, length, area, and diameter) and root uptake efficiency of Pteris vittata, an arsenic (As) hyperaccumulator and Nephrolepis exaltata, not an As hyperaccumulator, in relation to plant uptake of As and nutrients in an As‐contaminated and a control soil. After 8 weeks of growth, on a per plant basis, P. vittata accumulated 7.3–8.8 g of biomass and removed 2.51 mg of As from the As‐contaminated soil compared to 2.4–2.7 g of biomass and 0.09 mg of As for N. exaltata. This was partially because P. vittata developed a more extensive root system, 2.4–3.8 times greater (biomass, length, and area), and possessed a greater proportion of fine roots than N. exaltata. In addition, the As root‐uptake efficiency (defined as As concentrations in plant tissue per unit root) for fronds of P. vittata was 15–23 times greater than that of N. exaltata in both soils. Whereas N. exaltata removed phosphorus (P) more efficiently from the soils, P. vittata removed As more efficiently. The larger root biomass coupled with more efficient root‐uptake systems for As may have contributed to As hyperaccumulation by P. vittata.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号