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1.
ABSTRACT

This study investigated the effect of liquid fertilizer treatments on growth, flowering, leaf mineral content, and rhizome production during forcing of Curcuma alismatifolia ‘Chiang Mai Pink’ and C. thorelii ‘Chiang Mai Snow’. Plants were irrigated with 200 mL of 1.3 g L?1 of 15 nitrogen (N) -7 phosphorus (P) -14 potassium (K) water soluble fertilizer at 0, 1.3, 2.7, 4.0, 5.3, or 6.6 g L?1 weekly. Days to flower, flower stem length, and leaf length were recorded, the mineral contents in leaves were analyzed, and the number of rhizomes with tuberous roots were recorded at harvest. Flowering of the first inflorescence in both C. alismatifolia ‘Chiang Mai Pink’ and C. thorelii ‘Chiang Mai Snow’ was significantly delayed when plants received 6.6 g L?1 fertilizer as compared to the control plants. The number of rhizomes with more than 4 tuberous roots was highest when plants received 2.7 g L?1 fertilizer. No medium-sized rhizomes with more than seven tuberous roots were produced when ‘Chiang Mai Pink’ plants received 0, 4.0, 5.3, and 6.6 g L?1 fertilizer. Based on the production of rhizomes with four to six tuberous roots, optimum concentration of 15N -7P -14K water soluble fertilizer is 2.7 g L?1 for C. alismatifolia ‘Chiang Mai Pink’ and 1.3 to 4.0 g L?1 for C. thorelii ‘Chiang Mai Snow’. Although high boron content occurred only in the outer part of the second leaf when fertilizer concentrations were increased, leaf-margin burn (LMB) symptoms were not observed in both species and this could not be related to the production of rhizomes.  相似文献   

2.
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3.
Purpose: Roses are one of the ornamental species of major importance and economic value. Fertilisation programmes which maximise plant growth and quality, while minimising environmental impact are important. Here, we followed the N and K dynamics during rose development with the aim to define the nutrient demands as a basis for implementing fertigation programmes.

Materials and methods: Roses with one basal break were grown in a closed hydroponic system. Destructive samples were taken to determine dry weight, N and K content. In each sample, plants were sectioned into roots, rootstock, basal break, stems and leaves from the zone of active leaves and the zone of cutting flowers, as well as the flower bud in the latter.

Results: The shoots of the active leaves and cutting flowers zones exhibited a biphasic growth; dry weight, N and K increased after pruning of the zone of active leaves and the cutting flowers zone, however, in the second phase, total dry weight did not show a significant difference between the phenological phases, while the accumulation of N and K decreased throughout the entire plant.

Conclusions: Our results suggest that greenhouse roses develop a dynamic and complex balance between the aerial parts of the plants and the roots for storage and/or transport of photoassimilates, N and K. The total demand for N was 411 and 799?mg per plant for the initial shoot development of the active leaf zone and cutting flowers zone, respectively. The demand for K was 149 and 106?mg per plant for both shoots, respectively. The loss of N (555?mg per plant) and K (167?mg per plant) from roses plants to the root environment implies that lower fertiliser inputs can be used as these nutrients may be re-uptaken by new emerging roots.  相似文献   

4.
Abstract

Soil and hydroponic experiments were carried out to examine the influences of intercropping and nitrogen supply on flavonoid exudation in wheat roots. Both experiments comprising three cropping patterns (wheat intercropped with faba bean, monocropped wheat, and monocropped faba bean) and three N supply levels (deficient, adequate, and excessive) with three replicates in a randomized complete block design. Across two experiments, intercropping increased but N fertilization decreased flavonoids of wheat roots frequently. Intercropping variably increased secretion of naringenin from 0.5 to 1.9 folds (P?<?0.5) in wheat roots at all three N levels, but rarely increased secretion of genistein and hesperetin in wheat at the deficient N level. Intercropped wheat secreted more flavonoids than monocropped wheat at its tillering (60th d) and flowering (95th d) stages; after the flowering stage, however, the differences between intercropping and monocropping were not significant at any N level. Secretion of flavonoids in wheat roots decreased with increased N supply. Interspecies and N supply altered the contents and proportions of flavonoids in wheat root exudations under wheat and faba bean intercropping. These results indicate facilitative root–root interactions and provide insight into cereal promote nodule of legume in intercropping system.  相似文献   

5.
Abstract

Two field experiments, one in large plots and the other in small framed plots, were conducted in Umeå, northern Sweden. The objectives were (1) to examine the seasonal patterns of rhizome growth and nutrient dynamics of the energy crop reed canary grass (Phalaris arundinacea L.) in ley I and II, and (2) to evaluate the roles of soil type (mineral vs. organic), fertilisation level (0, 50, and 100 kg N ha?1s), and season/harvest time (Oct-96, May-97, and Aug-97) on the rhizome growth and nutrient dynamics by means of a factorially designed experiment. The general pattern of rhizome growth was that biomass was low in June during initiation of shoot growth, but increased steadily during the growing season, reached a peak in late autumn, and remained high until next spring. The N and P accumulation in rhizomes followed a similar pattern. During ley years I and II, reed canary grass rhizome growth was less dependent on soil type, and more dependent on fertilisation and season, with fertilisation being the most important predictor of growth. The season/harvest time, followed by soil type, was the most important factor for both concentrations and therefore total uptake of N, P, and K in rhizomes. Soil type affected N content in rhizomes significantly, and also interacted with season and enhanced the effect on N, P, and K content in rhizomes. The seasonal dynamics of the nutrient content in rhizomes indicate a remobilisation of the nutrients from rhizomes to the regrowth of shoots and roots in spring and relocation/storage from aboveground shoots to rhizomes during late summer and autumn. The results of this study suggest that delaying the harvest to later than October would result in considerably more energy and nutrient resources being translocated from aboveground shoots to rhizomes for growth in the next season.  相似文献   

6.
The effect of nitrogen (N) supply on growth and N uptake of Miscanthus sinensis during the establishment was determined. Seven different N addition regimes were compared in a nutrient solution experiment. In the treatments N111 (severe deficient), N222 (moderate deficient), N333 and N444 (optimal for maximum growth) different N concentration ranges were held constant during the entire growing season. In the treatments N144, N414 and N441 plants were subjected to low (1) N concentration in one of three experimental periods, whereas the N concentration was high (4) in the other two periods. Depending on the N demand of the plants, N concentrations were adjusted to 250–500 μM (N1), 500–1000 μM (N2), 1250–2500 μM (N3) and 2500–5000 μM (N4) when the N concentration in the N222 treatment had dropped below 100 μM. The other elements in the solution were replenished according to the estimated element ratios in the plants. As a reference the potassium concentration in the solution was measured regularly. During the first year plants with a non-limited N supply (N444) produced new tillers and increased the length of individual tillers until the end of the growing season. This resulted in a 48% shoot dry matter increase late in the growing season between August and October and a linear increase of cumulative N uptake between July and October. Limited N supply during the entire growing season (N111, N222) caused lower shoot yields but rhizome and particularly root dry weights were less affected. Significant final yield losses were also observed when the N supply was limited only during the first 7 weeks of growth (N144). By contrast, final shoot yield was hardly affected when the plants were exposed to limited N supply over a period of 9 weeks at the end of the growing season (N441). In the second year regrowth of shoots in spring was affected by the previous year's N supply, since five weeks after the beginning of regrowth, shoot dry matter was significantly positively correlated with N contents in rhizomes and shoots in the previous October. Our results show, that N supply at the beginning of the growing season has a major effect on final yield in the first establishment year of M. sinensis. However, from the second year on, the capacity of N reserves in rhizomes and roots affects spring growth much more than current N supply.  相似文献   

7.
《Journal of plant nutrition》2013,36(10):2091-2002
ABSTRACT

Two cultivars of wheat (Triticum aestivum cvs. Fresco and Hussar) were grown in hydroponic culture with nitrogen (N) supplied either as nitrate or equimolar ammonium and nitrate, and with a range of concentrations of NaCl from 0 to 100 mM. Plant growth was stimulated by low concentrations of NaCl and was depressed by high concentrations of NaCl. Growth was higher with mixed N nutrition than with nitrate supplied alone at all rates of NaCl supply. Shoot:root ratio was also depressed by salinity. Concentrations of potassium (K) decreased with salinity and were generally higher with mixed N supply, whereas concentrations of Na were higher with salinity and lower with mixed N supply. There were strong positive linear relationships between total plant dry mass and the concentrations of copper (Cu) in the roots and strong negative linear relationships between total plant dry mass and the concentrations of manganese (Mn) in both shoots and roots and zinc (Zn) in the shoots. The concentrations of Cu in the roots were higher with mixed N supply, lower with high salinity, and the concentrations of Mn in both shoots and roots were lower with mixed N supply and generally higher with high salinity. Tissue concentrations of these ions appear to be major determinants of wheat growth in saline environments.  相似文献   

8.
Twelve Azospirillum brasilense strains isolated from wheat (Triticum aestivum L.) roots were compared for root colonization, growth stimulation, and nitrogen (N) supply to young wheat plants cv. Klein Chamaco grown in sterile nutrient solutions without N. All the strains inoculated colonized both the root surface and interior, and most strains stimulated root and shoot growth, although the degree of stimulation was different for the different strains. Some strains increased the total N content of roots and tops at the end of the experiment, in one case up to 80% of the uninoculated plants, while others produced no effect on N content. No correlation could be found between growth stimulation or the amount of N supplied to the plant with the degree of root colonization. When the most efficient strain for N fixation was inoculated to different wheat cultivars, it stimulated growth and supplied N to the five cultivars tested, although the degree of root colonization, growth stimulation and N supply showed differences among the cultivars. Our results suggest that there exists the potential of A. brasilense to supply N to wheat plants in considerable amounts, although an adequate strain are still to be identified.  相似文献   

9.
Abstract

Seedlings of four maize hybrids were grown hydroponically to investigate the impact of different N sources (Ca(NO3)2, (NH4)2SO4 and a 1:1 mixture of both) on (i) production and partitioning of root and shoot dry matter, (ii) concentration of soluble carbohydrates in roots and shoots and their partitioning to these plant parts, (iii) concentration of starch in the shoot, and (iv) N uptake. During the main phase of the experiments (duration 14d), the plants were grown in a greenhouse at 25/22°C day/night temperatures and a photoperiod of 16h. Nitrogen was supplied at three concentrations (2.8, 28, and 280 ppm). The root‐zone pH was 6.5. Under the lowest N supply, the N sources produced similar root and shoot dry matters. At the highest N level (280 ppm), NO3‐fed plants were superior. In contrast, the mixture of NH4 and NO3 ? was optimum at 28 ppm. More or less pronounced N form by N concentration interactions were also found in the concentration and distribution of soluble carbohydrates and in all remaing traits. There were almost statistically significant cultivar by N form interactions in shoot dry matter (P = 0.07) and total dry matter (P = 0.06), indicating the existence of considerable genotypic variation in sensivity to NH4‐N.  相似文献   

10.
  目的  探索不同产地滇重楼植物体不同部位和根际土壤中氮（N）磷（P）钾（K）元素含量分布规律,区分不同产地滇重楼植物体与根际土壤N、P、K营养元素含量差异性,为滇重楼栽培种植提供理论依据。  方法  采用常规方法测定滇重楼根茎、须根以及根际土壤中的N、P、K含量。  结果  不同产地滇重楼须根中N、P、K含量分别在0.554 ~ 2.057 mg g?1、0.616 ~ 5.498 mg g?1、1.250 ~ 14.080 mg g?1之间,根茎中N、P、K含量分别在0.137 ~ 1.610 mg g?1、0.561 ~ 2.261 mg g?1、0.768 ~ 6.496 mg g?1之间,根际土壤中N、P、K含量分别在0.071 ~ 0.711 mg g?1、3.308 ~ 23.557 mg g?1、1.991 ~ 20.795 mg g?1之间;须根对N、P、K的富集系数分别在1.183 ~ 22.471、0.049 ~ 0.884、0.207 ~ 2.325之间,根茎对N、P、K的富集系数分别在0.314 ~ 13.021、0.041 ~ 0.570、0.056 ~ 1.493之间;野生和栽培滇重楼植物体及根际土壤中N、P、K含量特征未有明显区分。  结论  不同产地滇重楼植物体中N、P、K含量大小均为K > P > N,根际土壤中N相对匮乏,P比较丰富;野生品根茎中N、K含量整体上高于栽培品,P含量则相反;栽培品须根中N、P、K含量整体上高于野生品;栽培品与野生品根际土壤中N、P、K含量大致相当;各产地滇重楼须根中的N、P、K含量都显著高于根茎。  相似文献   

11.
Abstract

A field experiment was conducted in northern Sweden between 1995 and 1997, with the objectives (1) to quantify the dynamics of carbon accumulation in above- and belowground crop components of reed canary grass (RCG) during the second and third year after sowing and (2) to examine the effect of fertilization and soil type (mineral vs. organic) on C allocation. Across all treatments, carbon accumulation in belowground organs in the top 20 cm was on average 3 and 3.4 Mg C by the end of the second and third year, respectively, with roots and rhizomes accounting for up to 80%. Roots contributed most to belowground C mass during the second growing season but during the preceding winter, root biomass C decreased by 44–67%, and, thereafter, during the third growing season, the proportion of rhizome C increased. The dynamics of root biomass was considerably high, suggesting high root turnover rates. Rhizomes support re-growth during spring and rhizome biomass seems to increase with crop age. Thus, early harvesting before October may impact on the productivity during the following season.

Among the factors studied, harvest date was the most influential and affected C allocation in all crop components considerably. Fertilization stimulated growth of shoots, rhizomes, and BSBs (belowground shoot bases) but not that of roots. However, root biomass was higher in the organic than in the mineral soil. In this study, we considered only plant components above 20 cm depth. More detailed studies are needed to calculate more complete soil C balances. However, high belowground biomass production and root turnover indicate a high C input to the soil, which may result in positive soil C balances. Therefore, RCG cropping could have considerable carbon-sequestration potential.  相似文献   

12.
Endophytic bacteria carrying out dinitrogen (N2) fixation and indole acetic acid (IAA) synthesis were firstly identified in C. alismatifolia, a globally important flower crop. Their potential as growth promoters to stimulate the rapid growth of host plant was also examined. It will be beneficial to reduce the propagation period of tissue culture plantlets, and also utilize as a biofertilizer for rhizome production in the field. Seven endophytic bacteria were isolated from the leaf, four isolates from the leaf base, and two from the rhizome. ECS203, a gram-negative bacterium with a round shape, showed the highest N2 fixation at 4.2 nmol C2H4/106 cells/hr, and ECS202 showed the highest IAA synthesis at 296 μL μg ? 1 protein. Three selected isolates of N2-fixing and IAA synthesizing endophytic bacteria, i.e., ECS202, ECS203, and ECS204, isolated from the leaf base, were used to reinoculate Curcuma plantlets derived from tissue culture. Then, plants were grown in sterilized sand for 2 months and weekly supplied with N-free nutrient solution. Plant growth, colonization, nitrogen fixation, and IAA synthesis were measured at two months after planting. The inoculated plants clearly showed a better performance of plant growth and yield in terms of the plant height, plant weight, leaf area, and diameter of new rhizomes compared with uninoculated plants. The chlorophyll content and N concentration of leaves and roots also increased in inoculated plants. Endophytic bacteria from inoculated plants colonized the roots, rhizome, and leaf base. Partial sequence analysis using 16S rDNA indicated that the isolate ECS202 corresponded to Sphingomonas pseudosanguinis (99.2% similarity over 1,371 bp), ECS203 to Bacillus drentensis (99.4% similarity over 1,450 bp) and ECS204 to Bacillus methylotrophicus (99.9% similarity over 13,06 bp).  相似文献   

13.
An investigation was conducted to determine the effect of potassium (K) nutrition on alfalfa (Medicago sativa L.) growth and metabolism of root total nonstructural carbohydrates (TNC) and proteins, and to study whether nitrogen (N) fertilization overcomes N deficiency and low root protein concentrations caused by K deficiency. In Experiment 1, nodulated alfalfa plants were grown in plastic pots containing washed quartz sand and provided minus‐N Hoagland's solution containing 0, 0.6, or 6.0 mM K. Shoot and root K concentrations increased with increasing solution K. Root N concentrations were higher in plants receiving 6.0 mM K than in plants receiving 0.6 or 0 mM K, but shoot N concentrations were similar for all treatments. Plant persistence, shoots per plant, and shoot mass increased as solution K levels increased. Root starch concentration and utilization were positively associated with K nutrition. Total amylase activity was higher, but endoamylase activity was lower in roots of plants receiving 6.0 mM K compared to plants receiving 0.6 or 0 mM K. Root soluble protein concentrations were significantly higher in plants receiving 6.0 mM K than in plants receiving 0 or 0.6 mM K. In Experiment 2, plants were supplied with Hoagland's solution containing 10 mM N as ammonium (NH4 +) or nitrate (NO3) with 0,3, or 6.0 mM K. The addition of N increased root N concentrations only in plants receiving 0 mM K. Plant persistence was reduced by NH4 + application, especially in plants receiving 0 or 3 mM K. Root starch concentrations were markedly reduced in plants receiving NH4 + at all K levels. The addition of NO3 ‐ had little effect on alfalfa root carbohydrate and protein metabolism and subsequent shoot growth. Potassium deficiency reduced starch and protein concentrations in roots; factors that were associated with poor persistence and slow shoot regrowth of alfalfa.  相似文献   

14.
An adequate supply of nitrogen (N) is important for patumma growth and flower quality. This study aimed to compare the uptake and translocation of N by foliar and root application. Fertilization with 15 nitrate (NO3)-N via roots or leaves was carried out at four stages, at the 1st to 4th fully expanded leaf (FEL) stages, and the plants were sampled at each successive stage. The uptake and translocation of 15N from foliar or root applications showed relatively similar patterns at all stages. Although the N fertilizer utilization rate by roots was higher than that via leaves, the foliar application stimulated reproductive growth by earlier flowering. The N supplied at the 1st FEL and the 2nd FEL was utilized mainly in leaves, whereas supplying N at the 3rd and 4th FEL promoted flower quality. Fertilizer application method and stage of application influence the utilization rate and translocation of N to the sink organs.  相似文献   

15.
氮肥施用量对甘薯产量和品质性状的影响   总被引：6，自引：1，他引：5  
【目的】氮是影响作物产量和品质性状的重要因素,合理施氮是提高作物产量和改善品质的主要途径。研究施氮量对甘薯块根产量形成、营养品质和淀粉糊化特性的影响,对于明确江苏徐淮地区甘薯种植的适宜施氮量具有重要意义。【方法】本文选用淀粉型甘薯品种徐薯22和兼用型甘薯品种徐薯28为试验材料,设置5个施氮水平0、60、120、180、240 kg/hm2。调查了甘薯不同生育期的叶面积指数、光合势、干物质积累和产量构成要素,采用分光光度法测定了块根主要营养品质指标,利用Tech-master型RVA快速测定淀粉谱粘滞特性,分析明确施氮量对块根主要品质指标和淀粉糊化特征值的影响。【结果】施氮N 60 kg/hm2增加了各生育期甘薯的叶面积,提高了甘薯的光合势,显著增加了块根产量(徐薯28增产16.38%,徐薯22增产9.31%),过量施氮(N 240 kg/hm2)则产量降低。施氮并未显著降低块根中的淀粉和直链淀粉含量,但明显增加了可溶性糖和蔗糖含量。施氮显著提高最高粘度、最低粘度、最终粘度和消减值。相关分析显示,直链淀粉含量与最高粘度值和崩解值呈极显著或显著负相关(相关系数分别为-0.90**和-0.71*);直链淀粉含量与消减值呈显著正相关(相关系数为0.73*)。【结论】综合考虑甘薯的产量和品质,在本实验条件下甘薯较为适宜的氮肥用量约为60 kg/hm2。  相似文献   

16.
Abstract

The interacting effects between topsoil water supply, nitrogen (N) placement and subsoil aluminum (Al) toxicity on wheat growth were studied in two split‐root pot experiments. The native nitrate‐N (NO3‐N) in the topsoil used in each experiment differed and were designated as high (3706 μM) and low (687 μM) for experiments one and two, respectively. Wheat was grown in pots that enabled the root system to be split so that half of the roots were in topsoil and the other half were in subsoils containing varying concentrations of soluble Al. Treatments were imposed which varied the supply of water to the topsoil (either ‘wet’ or ‘dry'). Placement of applied N in either the topsoil or subsoil had little effect on either shoot or root fresh weight, or on the length of roots produced in the subsoil section of the split pots. When water supply to the topsoil was decreased, both shoot and root growth of wheat declined and the yield decrease increased with subsoil Al. In the high‐N experiment, wheat grown in the low Al subsoil with the high native soluble subsoil (NO3 (3002 μM) was able to exploit the N and subsoil water, hence both shoot and root growth increased considerably in comparison to shoot and root growth of wheat grown in soils containing higher concentrations of subsoil Al. When the native NO3 was lower (i.e. the low‐N experiment) inadequate root proliferation restricted the ability of plants to use subsoil N and water irrespective of subsoil Al. The results from this study suggest that wheat, grown on yellow earths with Al‐toxic subsoils, will suffer yield reductions when the topsoil dries out (e.g. in the spring when winter rainfall ceases) because subsoil reserves of water and nitrogen are under utilised.  相似文献   

17.
Low nitrogen (N) supply may change assimilate partitioning between plant organs. We measured the effect of N supply on partitioning of recently assimilated 13C and recently absorbed 15N between generative and vegetative plant organs of two maize genotypes (Zea mays L.) 14 d after silking, i.e., during the lag phase of kernel growth. Furthermore, net partitioning of dry matter and N were assessed during grain filling. Plants were grown in a greenhouse in large containers. Our hypothesis was that N deficiency reduces grain set due to low partitioning of carbon (C) and N to the grains during the lag phase and reduces grain yield also because of excessive remobilization of N from the leaves during grain filling. During the lag phase, low N supply increased partitioning of recently assimilated photosynthates towards stem and roots at the expense of partitioning towards reproductive organs. However, despite of diminished sink strength of the reproductive organs for photosynthates, sugar concentrations in the grains of N‐deficient plants were increased, indicating that kernel set and potential kernel weight were not limited by low C supply at the end of the lag phase. In contrast to C, partitioning of recently absorbed N towards the reproductive organs was increased at low N supply at the expense of partitioning towards the roots. This indicates different mechanisms for the regulation of C and N distribution within the plant. During grain filling, biomass partitioning between plant organs was more affected by genotype than by rate of N supply. Nitrogen accumulation in the grains substantially exceeded total N uptake in the plant after flowering. Excess N accumulation in the grains was covered mainly by depletion of stem N at high N supply and by depletion of leaf N at low N supply. However, high concentrations of nonstructural carbohydrates in the stem at maturity indicated that grain yield of N‐deficient plants was not limited by low source strength of N‐depleted leaves.  相似文献   

18.
Potassium (K) is one of the most absorbed nutrients by cassava because it acts on the synthesis and starch accumulation in the storage roots. Here, we show that K application at the beginning of the second vegetative cycle of cassava submitted to shoot pruning increased the yield of roots and starch, and the nutrient demand of plants. Application of 45–89 kg ha?1 dipotassium oxide (K2O) in the second cycle increased the yield of storage roots and starch from 36–49% and K applied at this time had a greater effect on the synthesis and allocation of starch in the storage roots. K supply increased the accumulation of N and S by 2.0- to 3.0-fold and the accumulation of other nutrients by 1.4- to 1.7-fold. The removal of phosphorus (P), manganese (Mn), and zinc (Zn) by storage roots was not affected by K application, whereas the removal of other nutrients increased by 1.3- to 4.3-fold.  相似文献   

19.
ABSTRACT

Cluster root formation by white lupin (Lupinus albus L. cv. Kiev Mutant) in response to stratified application of hydroxyapatite was examined in a split-root system. The system consisted of two vertical compartments, each divided horizontally into five 60-mm layers. Hydroxyapatite was applied to different layers at 150 mg phosphorus(P) kg?1 soil. The proportion of dry biomass of cluster roots in the whole root system was significantly reduced when P concentration was high in shoots due to P application, suggesting that cluster root formation was regulated by the shoot P status. However, the cluster root percentage increased in the soil layer supplemented with P, and decreased in other layers, especially when P was applied in a deep layer. The formation of cluster roots is regulated by internal plant P status, but is also greatly affected by localized P supply. Heterogeneous P supply can modify the distribution of cluster roots.  相似文献   

20.
Abstract

The objective of this study was to determine the effect of phosphorus applied through fertigation on growth and root yield of cassava. This was achieved through a greenhouse pot-experiment consisting of 1, 4, 7, 10, 20 and 30?mg?P?L?1. Increasing P from 1 to 30?mg?P?L?1 realized a 57.1 and 150.0% increase in leaf blade P in 2014 and 2015, respectively. Similarly, chlorophyll content and shoot growth increased as P concentration in solution increased. However, leaf stomatal conductance and net photosynthesis reached a maximum in 7 and 20?mg?P?L?1 in 2014 and 2015, respectively. This trend of stomatal conductance and net photosynthesis was consistent with that of dry root yield and storage roots numbers. Regressing dry root yield against storage root numbers showed that R2 = 0.80. Phosphorus encourages formation of storage roots and the duration of cassava’s growth affects the amount of P required for maximum root yield.  相似文献   

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