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1.
Abstract

Different rates of K, Ca, and Mg were applied to bulklots of Decatur clay loam (pH 5.8) which had been collected from an area under natural vegetation. Nitrogen and P were each applied at the rate of 100 ppm. Soybean (Glycine max L.) and corn (Zea mays L.) were planted to pots in four replications of each treatment. Plants were grown for 6 weeks and subsequently all the pots were re‐planted to soybeans. This crop rotation was repeated until six crops had been harvested from each pot.

Potassium fertilization did not affect soybean growth but increased the dry matter of corn plants. Calcium application affected the growth of neither crop, but Mg addition to the soil reduced the growth of both crops. The composition of the plants generally reflected the available amounts of each nutrient. Additionally, Mg consistently decreased K in soybeans but increased Mn in the two crops. The inclusion of corn in rotation with soybeans resulted in the following effects on the succeeding soybean harvests: more tolerance to high Mg, greater reduction of plant Ca and Mg caused by K application, and lower levels of available K and Ma in soils and soybeans. However, the greater rate of depletion of soil K and Mn under corn rotation did not appear Co affect the dry matter yields of the following soybean plants relative to the plants under the continuous soybean cropping system.  相似文献   

2.
Corn (Zea mays cv. Hycorn 82) and mungbean (Vigna radiata cv. Berken) plants were grown for 14 d in dilute nutrient solutions containing constant lanthanum (La) concentrations from 0 to 1.37 μM. Solutions were maintained at pH 4.5 to prevent precipitation of La. Lanthanum at 0.63 μM increased the root growth of corn by 36% and 0.19 μM La increased mungbean root growth by 21% relative to controls. However, no beneficial effects of La on the total dry matter yield of either plant species were demonstrated; that of corn was unaffected, whilst that of mungbean was reduced by over 30% at solution La concentrations greater than 0.19 μM.

Roots of both plant species accumulated 20 to 150 times higher concentrations of La than the shoots. The highest La concentrations in roots were 1775 mg/kg in corn and 2955 mg/kg in mungbean. Where La was added to the nutrient solutions, concentrations of La in the shoots ranged from 9 to 16 mg/kg for corn and from 34 to 52 mg/kg for mungbean. The oldest leaves of both plant species accumulated higher La concentrations than found in the remainder of the shoots. Both plant species demonstrated an ability to restrict the uptake of La into the shoots, as the concentrations of La in the shoots increased only slowly with increasing concentrations of La in the roots and in the nutrient solution. The data suggest critical shoot and root La concentrations of the order of 34 and 775 mg/kg respectively, for toxicity in mungbean. Critical La concentrations for toxicity in corn must be grsater than 16 mg/kg in shoots and 1775 mg/kg in roots.  相似文献   

3.
Nutrient requirements o£ plants during their various phases of growth are affected by several internal and external factors. The changes in rate of uptake by root with age are an important factor to meet the increasing plant demand for nutrients. Nutrient culture experiments were carried out under controlled greenhouse conditions with corn (Zea Mays L.) and alfalfa (Medicago sativa L.) to investigate the relationship of stage of growth to changes in plant parameters and nutrient uptake properties. With advancement of age. both plant species increased their ambient growth medium pH towards neutrality. With increasing age in alfalfa there was very little change in observed S:R ratio and root growth rate. On the other hand in corn plants the S:R ratio increased and growth rate for root and shoot decreased with age. Alfalfa contained higher concentrations of N, K, Na, and Ca than corn; while ion concentrations in both crops decreased with plant age. At all stages of growth, alfalfa absorbed less nutrients than corn. The rates of nutrient influx, In in both the crops showed various degrees of correlation with age and rate of shoot growth. In corn. In for ions reached a maximum at 25 days growth; whereas, in alfalfa, In reached maximum at 30 days of growth. The differences in influx rates for different ions in the two species are probably due to the difference in development of shoot and root parameters and shoot demand for the ions.  相似文献   

4.
Zinc (Zn) deficiency is more common in corn (Zea mays L.) than in sorghum [Sorghum bicolor (L.) Moench] or wheat (Triticum sp.). The ability of wheat to withstand low soil Zn conditions is related to increased release of phytosiderophore from its roots. The reasons for sorghum's ability and corn's inability to utilize low levels of soil Zn have not been explored adequately. The objectives of this research were to 1) ascertain if Zn deficiency could be induced in sorghum, wheat, and corn grown in a chelator‐buffered nutrient solution and 2) determine relative releases of phytosiderophore from roots of sorghum, wheat, and/or corn under Zn‐deficiency conditions. Sorghum, wheat, and corn were grown hydroponically in the greenhouse with a chelator‐buffered nutrient solution designed to induce Zn deficiency, while supplying adequate amounts of other nutrients. Root exudates were collected over time to measure phytosiderophore release. Shoot Zn concentrations and shoot and root dry matter yields were determined also. The technique was effective for inducing Zn deficiency in sorghum, wheat, and corn, as evidenced by reduced shoot and root dry matter yields, shortened internodes, reduced shoot Zn concentrations, and plant Zn concentrations below the suggested critical values for these species. Sorghum and wheat plants increased the release of phytosiderophore in response to Zn deficiency, but com did not. The total amount of phytosiderophore released by the roots was in the order wheat>sorghum>corn. The absence of a “phytosiderophore”; response to Zn deficiency of corn, coupled with the evidence that this species requires, or at least accumulates, more Zn than wheat or sorghum, provides an explanation as to why Zn deficiencies are more prevalent for corn than wheat or sorghum under field conditions.  相似文献   

5.
Abstract

The forage crops corn (Zea Mays), sorghum‐sudangrass (Sorghum Vulgare Pers. x Sorghum sundanese stapf.), and kenaf (Hybiscus cannabinus L.) were irrigated with municipal effluent at rates of 5, 10, 15, and 20 cm/week on Lakeland fine sand. Plant samples were collected weekly from each plot to measure green weight, dry matter, and nitrogen content. From these data crop nitrogen (kg/ha) was calculated for each week. Finally, uptake of nitrogen was calculated to determine efficiency of nitrogen recovery from the effluent as the crops matured. In all cases efficiency of uptake decreased with increasing application rates, as expected from fertility studies. For corn, efficiency of uptake continued to increase up to harvest. For sorghum‐sudangrass and kenaf a peak was reached at about 50 days after planting, after which efficiency of uptake declined rapidly.  相似文献   

6.
Abstract

The logistic model has proven very useful in relating dry matter production of forage grasses to applied nitrogen. A recent extension of the model coupled dry matter and plant ? accumulation through a common response coefficient c. The objective of this analysis was to establish the validity of the extended model for each of the three major nutrients (?, ?, ?), with a common coefficient c between dry matter and each applied nutrient. Analysis of variance established the validity of this hypothesis. The model accurately described response of dry matter, plant nutrient removal, and plant nutrient concentration to applied nutrient, with overall correlation coefficients of 0.9928, 0.9972, and 0.9975 for applied N, P, and K, respectively. Furthermore, the model closely described the relationship between yield and plant nutrient removal, as well as between plant nutrient concentration and plant nutrient removal, for each nutrient. This work confirmed earlier results for applied ? with various grasses and established the validity of the model for applied ? and ? for the first time. The logistic equation is well‐behaved and simple to use on a pocket calculator. It can be used to describe yields and nutrient removal in evaluation of agricultural production and environmental quality.  相似文献   

7.
Abstract

Crop growth in Oxisols is known to be limited by high soil acidity and low levels of basic cations. Five greenhouse experiments were conducted to evaluate the effects of soil pH on the growth and nutrient uptake of upland rice (Oryza sativa L.), wheat (Triticum aestivum L.), corn (Zea mays L.), common bean (Phaseolus vulgaris L.), and cowpea (Vigna unguiculata L. Walp.). Six levels of soil pH (4.1, 4.7, 5.3, 5.9, 6.6, and 7.0) were achieved by addition of various levels of CaCO3. Crop species responded differently to pH, reflecting the genetic diversity among species. Higher dry matter accumulation in roots and tops of rice, corn, and cowpea was observed at acidic pH ranges indicating that these species are tolerant to soil acidity. However, increasing soil pH enhanced dry matter accumulation in roots and tops of wheat and common bean, reflecting their intolerance to soil acidity. In all of the crop species, uptake of calcium (Ca) and magnesium (Mg) decreased with a decrease in soil pH. Overall uptake of zinc (Zn), manganese (Mn), and iron (Fe) in all species increase with a decrease in soil pH. Higher pH in an Oxisol might induce micronutrient deficiencies; therefore, one has to avoid overliming. In general, increasing soil pH decreased the uptake of nitrogen (N), phosphorus (P), and potassium (K) in rice, but uptake of these elements increased in wheat, corn, and common bean. In order to achieve the full genetic potential of any given species on an Oxisol, one needs to consider the species tolerance to soil acidity and its nutrient demand.  相似文献   

8.
Arbuscular mycorrhizal fungi (AMF) have the capability to improve crop yields by increasing plant nutrient supply. A pot experiment was conducted under natural conditions to determine the response of AMF inoculation on the growth of maize (Zea mays L.), sorghum (Sorghum bicolor L.), millet (Pennisetum glaucum L.), mash bean (Vigna mungo L.), and mung bean (Vigna radiata. L.) crops during 2008. The experiment was conducted as a completely randomized design in three replications using phosphorus (P)–deficient soil. Three plants were grown in 10 kg soil up to the stage of maximum growth for 70 days. Spores of AMF were isolated from rhizosphere of freshly growing wheat and berseem crops and mixed with sterilized soil with fine particles. Crops were inoculated in the presence of indigenous mycorrhiza with the inoculum containing 20 g sterilized soil mixed with 40–50 AMF spores. Inoculation with AMF improved yield and nutrient uptake by different crops significantly over uninoculated crops. Inoculated millet crop showed 20% increase in shoot dry matter and 21% in root dry matter when compared with other inoculated crops. Increases of 67% in plant nitrogen (N) and iron (Fe) were observed in millet, 166% in plant P uptake was observed in mash beans, 186% in zinc (Zn) was measured in maize, and 208% in copper (Cu) and 48% in manganese (Mn) were noted in sorghum crops. Maximum root infection intensity of 35% by AMF and their soil spore density were observed in millet crop followed by 32% in mash beans. Results suggest that inoculation of AMF may play a role in improving crop production and the varied response of different crops to fungi signifies the importance of evaluating the compatibility of the fungi and plant host species.  相似文献   

9.
ABSTRACT

Winter camelina [WC, Camelina sativa (L.) Crantz] and field pennycress (FP, Thlaspi arvense L.) are emerging oilseed crops in corn–soybean rotations, but little is known about their cover crop potential. A 2-year study was conducted in Minnesota, USA to evaluate the effect of winter oilseed crops on nitrogen (N) use, growth and yield of corn and soybean. Treatments included WC, FP, winter rye (WR, Secale cereale L.), and a no cover crop (NC) control. Oilseed crops produced 40–50% less spring biomass and accumulated less N compared to WR. The tissue-N of WC and FP was 39.0% and 6.6% higher than WR, respectively. The C:N ratio of cover crops was lower than 20:1, suggesting rapid decomposition. Compared with NC, cover crops lowered soil nitrate before major crops planting, but the post-harvest N profile following corn and soybean was not affected. Compared with NC, cover crops significantly decreased corn yield, with 8.7%, 9.5% and 9.8% reduction following WC, FP and WR, respectively. Cover crops did not affect growth, yield and N uptake of soybean. Oilseed crops showed potential to improve N cycling in the rotation, but more research of their impact on major crops is needed.  相似文献   

10.
Physiological responses of plants to ammonium (NH4) versus nitrate (NO3) nutrition can vary considerably. A greenhouse study was conducted to examine the effect of ammonium‐nitrogen/nitrate‐nitrogen (NH4‐N/NO3‐N) ratio on dry matter partitioning and radiation use efficiency in corn (Zea mays L.). The hybrid Funks G 4673A was supplied with nutrient solutions that contained 8:1, 1:1, or 1:8 ratios of NH4‐N/NO3‐N. At each of four harvests, plants were separated into leaf blades, stem + leaf sheaths, and roots. Radiation use efficiency was calculated from these dry matter harvests and measured photosynthetically active radiation. Generally, more dry matter was partitioned to the stem than to leaf tissue when supplied with the 1:8 NH4‐N/NO3‐N ratio than when supplied with the other N treatments. Corn supplied with 8:1 and 1:1 ratios of NH4‐N/NO3‐N resulted in radiation use efficiency values for total dry matter that were significantly higher by 39 and 25%, respectively, than that of corn supplied with the 1:8 ratio indicating that Funks G 4673A was more efficient in converting radiation into dry matter when supplied with high proportions of NH4 than when supplied primarily with NO3.  相似文献   

11.
The knowledge of nutrient mobility is an important tool to define the best fertilizer management and diagnosis techniques. Patterns of boron (B) mobility in plants have been reviewed, but there is very little information on B distribution and mobility in cotton. An experiment was conducted to study plant growth and B distribution in cotton when the nutrient was applied in the nutrient solution or to the leaves, and when a temporary deficiency was imposed. Cotton (Gossypium hirsutum, Latifolia, cv. IAC 22) was grown in nutrient solutions where B was omitted or not for 15 days. Boron was applied to young or mature cotton leaves in some of the minus B treatments. Root growth decreased when the plants were transferred to B solutions, but there was a full recovery when B was replaced in the nutrient medium. Boron deficiency, even when temporary, reduced cotton shoot dry matter yields, plant height and flower and fruit set, and these could not be prevented by foliar application of B. Because of decreased dry matter production, leaves of deficient cotton plants actually showed higher B concentrations than non deficient leaves. This would be misleading when a mature leaf is sampled for diagnosis. If there is any B mobility in cotton phloem, it is very low.  相似文献   

12.
Dry matter yield and water uptake by barley (Hordeum vulgare L., cv. ‘Gus') and wheat (Triticum aestivum L., cv. ‘Inia 66') grown in full strength Hoagland nutrient solution were compared under three NaCl salinity levels in a growth chamber. Total dry matter yield decreased with increasing salinity for both plants, but wheat was more severely affected than barley at the high salinity level. Reduction in dry matter weights of barley and wheat were 57% and 67%, respectively, at the 1.2 MPa stress. Salt stress substantially decreased the number of tillers in both crops, however, this reduction was more severe for wheat than barley. The numbers of tillers were 10 and 7 for barley plants at 0.6 and 1.2 MPa stress, respectively. The respective values were 6 and 4 for wheat plants. Water uptake in both plants was substantially decreased by increasing salinity stress. This reduction was essentially similar for both plants. Water uptake per gram dry weight was not significantly affected by salt stress for barley. For wheat, only 1.2 MPa stress increased the amount of water absorbed per g dry matter produced.  相似文献   

13.
A greenhouse experiment to study the effect of humic acid (HA) on the growth and nutrient uptake of Teak (Tectona grandis L.f.), a tropical hardwood, was conducted in Ibadan, Nigeria. The plants were grown for four months in top soils (0–30 cm) collected from an Alfisol (high organic matter) and an Oxisol (low organic matter) in Southern Nigeria. Three levels of HA, viz:, 50, 500, and 1000 mg/kg were added to the two soils. The results indicated that HA was beneficial to the growth and nutrient uptake of teak seedlings. Plant monthly growth rates, and height and total dry matter yield increased significantly (p = 0.05) over the controls in the two soils at the three HA application levels. Effects of adding 500 mg/kg and more of HA to the Alfisol were less beneficial while plant parameters and nutrient uptake tended to increase with increasing amounts of HA in the Oxisol. A significant positive correlation was established between rate of HA application and plant height (r = 0.57), stem diameter (r = 0.77) and total dry matter yield (r = 0.67) in the Oxisol, whereas the HA application rate was significantly correlated only with height (r = 0.57) and root/shoot ratio (r = 0.56) in the Alfisol. The addition of HA to the two soils increased the uptake by seedlings of N, P, K, Mg, Ca, Zn, Fe, and Cu, while Mn was decreased.  相似文献   

14.
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   

15.
A new approach for determining optimum nutrient element ratios in plant tissue is presented. Essential steps in the procedure involve: a) measuring patterns of response to pairs of nutrient elements in factorial fertilizer trials, b) modeling the yield response surface using a bivariate, Mitscherlich‐related response function, c) defining balanced nutrition in terms of the parameters of the response surface, d) identifying combinations of P and S fertilizer resulting in balanced nutrition, and e) determining from plant chemical analysis the ratio of nutrients in plant tissue in nutritionally balanced combinations. The approach is illustrated by data from a phosphorus (P) by sulfur (S) factorial field fertilizer trial on a mown mixed white clover (Trifolium repens cv Grasslands Huia) and ryegrass (Lolium perenne L cv Grasslands Nui) sward. Different parameters of yield [total dry matter production, clover dry matter production, clover nitrogen (N) uptake] required different ratios of S:P in fertilizer and consequently in plant tissue for nutritional balance. Also, plant tissue S:P ratios for balanced nutrition declined as the level of nutrition increased. Economic optimum S:P fertilizer ratios were higher than those ratios required for nutrient element balance due to the lower cost and higher effectiveness per kilogram of fertilizer S compared with fertilizer P. Ratios of S and P to N in clover tissue were useful indicators of the adequacy of S and P for clover which was dependent on N2 fixation for its N supply. It is suggested that a nutrient element index system showing both relative and absolute nutrient element status might be built around N as an internal standard for legumes dependent on N2 fixation and possibly also for non‐legumes.  相似文献   

16.
Incinerating turkey manure is a new option in the USA to generate renewable energy and to eliminate environmental problems associated with manure stockpiling. Incineration produces turkey manure ash (TMA) with a nutrient content of 43 g phosphorus (P) kg?1 and 100 g potassium (K) kg?1. We conducted a greenhouse pot study using a low P (6 mg kg?1) and high K (121 mg kg?1) soil/sand mixture with a 7.0 pH to evaluate early growth response of corn (Zea mays L.) to TMA. A control and five rates based on P (5.6, 10.9, 16.5, 21.9, and 27.2 mg kg?1) and respective K contents in TMA were compared with triple-superphosphate and potassium chloride fertilizer. Plant height and stalk thickness at 24 and 31 days after emergence (DAE) were greatest with the fertilizer, but no differences were detected at the final sampling (52 DAE). Regardless of nutrient source, plant biomass increased with P rate. Because of faster initial plant development, corn dry matter 52 DAE was 15 to 20% greater with fertilizer than with TMA. Corn tissue P concentration was greater with TMA than with fertilizer, but P uptake was similar. Tissue micronutrient concentrations were greatest for the control. Bray 1 P appeared to extract excessive amounts of P in TMA-amended soil, whereas soil P levels with the Olsen extractant provided an estimate of plant-available P that was consistent with plant response. Based on this first approximation, we conclude that TMA is a potential source of P for field crops. Field studies are required to determine recommended application rates.  相似文献   

17.
Zinc (Zn) deficiency in annual crops is very common in Brazilian Oxisols. Data are limited on Zn uptake and use efficiency during crop growth cycles. A field experiment was conducted during two consecutive years with the objective to determine shoot dry weight and Zn uptake and use efficiency in upland rice, dry bean, corn, and soybean during growth cycles. Shoot dry weight of four crops was significantly increased in an exponential quadratic fashion with increasing plant age. Rice and corn had higher shoot dry weights and grain yields than dry bean and soybean. Zinc concentration in rice and corn decreased in a quadratic fashion with increasing plant age. However, in dry bean and soybean, Zn concentration had a quadratic increase. Zinc uptake followed an exponential quadratic response in four crops, and it was higher in corn and upland rice than in dry bean and soybean. Zinc use efficiency in shoot dry‐weight production had significant quadratic responses in upland rice and soybean with increasing plant age. In corn, Zn use efficiency for shoot dry‐weight production was linear as a function of plant age. Zinc use efficiency for grain production was maximum for corn and minimum for soybean. Hence, cereals had higher Zn use efficiency than legumes.

Zinc concentration in grain of dry bean and soybean was higher than in upland rice and corn, which is a desirable quality factor for human consumption so as to avoid Zn deficiency.  相似文献   

18.
Growing Fe-efficient genotype(s) could be considered as a preferred genetic approach to tackle the widespread constraint of Fe-deficiency-/lime-induced chlorosis in crop grown on alkaline soil. This study aimed to investigate morphological and physiological traits linked to expression of Fe deficiency among four corn (Zea mays) including sweet (Z. mays sacchrata cvs. H403 and H404) and grain (Z. mays indentata cvs. H500 and H700) hybrids grown in nutrient solution using two Fe concentrations (5 and 50 µM Fe-ethylenediaminetetraacetic acid (Fe-EDTA)). Significant variation was found among studied hybrids in their tolerance to Fe-deficiency stress. Sweet corn hybrids were more sensitive to Fe deficiency as compared with grain corn hybrids and greater reduction was observed in their shoot dry matter at the 5 µM Fe-EDTA treatment. The greatest decrease in plant height, leaf area, and root and shoot dry matter weight under Fe-deficiency condition was found for H403 hybrid. No significant correlation was found between shoot and root Fe concentration with crop tolerance to Fe deficiency. Furthermore, different response of corn hybrids to Fe deficiency is an important factor, which has to be considered in Fe fertilizer recommendation as well as breeding programs.  相似文献   

19.
《Journal of plant nutrition》2013,36(10):1757-1777
Abstract

The extended multiple logistic model has been used to describe seasonal dry matter and plant nutrient uptake in response to combinations of applied nitrogen (N), phosphorus (P), and potassium (K) for bermudagrass (Cynodon dactylon L) and tall fescue (F. arundinacea Schreb.). In this article, the model is used to analyze data for bahiagrass (Paspalum notatum Flügge) in an N × P × K = 3 × 3 × 3 factorial experiment at Quincy, FL. A procedure is illustrated for standardizing the model over two of the nutrients in order to focus on response to the third. Estimates are made of applied N, P, and K required to reach 50% of maximum potential yield. Similar calculations are included to achieve 50% of potential maximum plant P and K uptake. The strong sensitivity of plant P and K to applied levels of P and K is described as well.  相似文献   

20.
合理密植对不同株型烤烟冠层结构及光合生产特性的影响   总被引：1，自引：0，他引：1  
【目的】研究不同耐密性烤烟对密植的综合响应,为鉴选耐密品种及烤烟合理密植提供理论参考。【方法】采用两因素裂区试验设计,以云烟97 (塔形,低耐密)、NC71 (腰鼓形,中等耐密)、K326 (筒形,高耐密) 3类株型烤烟为主区,4个种植密度(13890、15150、16660、18510株/hm^2)为裂区,阐明不同株型烤烟农艺性状、冠层结构、物质积累、产量及构成对密植的响应规律。【结果】密植条件下(15150、16660、18510株/hm^2),烤烟株高显著增加,最大叶叶位明显下降,并逐渐表现为"高瘦"形态。品种因素对株高和最大叶叶位影响显著,不同品种间茎围无显著差异。随种植密度的增加,烤烟群体叶面积系数(LAI)呈增加趋势,尤其是耐密品种NC71和K326的LAI显著增加,不同密度间K326品种LAI空间分布变异最低。密植主要通过提高群体干物质生产力(单位面积有效叶片数)弥补单株生产力(上中等烟率、单叶重)的不足,从而获得结构性增产。云烟97品种群体产量以16660株/hm^2时最高,平均较对照(13890株/hm^2)显著增加15.51%;NC71品种群体产量以16660株/hm^2和18510株/hm^2间无明显差异,较对照分别显著增加17.61%和19.37%;K326密植效应最大,以18510株/hm^2群体产量最高,比对照提高24.51%。成熟期云烟97单株干物质在15150株/hm^2后持续下降,降幅范围为8.41%～21.08%,NC71和K326品种则在密度为16660株/hm^2时有显著降低。合理密植可发挥烤烟群体结构性增产潜力,紧凑品种(NC71、K326)的高耐密性表现为个体生理对密植响应迟钝,从而获得功能性增产。【结论】合理密植可充分发挥烤烟群体结构性增产潜力,不同品种耐密性差异主要表现为个体功能对密植响应的迟钝性强弱,本试验条件下,K326、NC71、云烟97品种密植分别为18510株/hm^2、16660株/hm^2、15150～16660株/hm^2时,可实现烤烟群体结构和个体功能平衡。  相似文献   

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