Application Effects of Controlled-Availability Fertilizer on Dynamics of Soil Solution Composition
Application Effects of Controlled-Availability Fertilizer on Dynamics of Soil Solution Composition
复制标题
控效肥料施用对土壤溶液组成动态的影响
DOI：
10.2136/sssaj1997.03615995006100060033x
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发表时间：
1997
影响因子：
2.9
通讯作者：
K. Kyuma
中科院分区：
文献类型：
--
作者：
J. Yanai;T. Kosaki;Aiko Nakano;K. Kyuma
采用盆栽试验，研究了控释肥（CAF）对土壤养分吸收和淋溶潜力的影响，并与土壤溶液化学组成的动态变化进行了相关分析。植物在49 d的生长期内，用环形中空纤维采样器从根区原位收集土壤溶液6次。还在第二、第四和最后一次采集日期采集小麦植株。土壤溶液中NO3和K的浓度在各采样时间点CAF处理均显著低于普通施肥处理。与普通施肥处理相比，CAF处理的N、K淋溶潜力相应降低，尤其是在植株生长初期。土壤中P的含量较低，受N处理的影响不显著，淋溶潜力可忽略不计。氮素处理对植物生长、氮、磷、钾养分吸收及其在土壤中的供应机制没有显著影响。因此，CAF的能力，以减少土壤养分的淋溶潜力，而不施加对植物的生长和养分吸收的不利影响被证明为N和K，在根区的土壤溶液组成的动态的基础上。
The effect of a controlled-availability fertilizer (CAF) on plant uptake and leaching potential of soil nutrients, in relation to the dynamics of the chemical composition of the soil solution, was evaluated using a pot experiment with three N treatments [CAF or ordinary fertilizer applied as Ca(NO 3 ) 2 and an unfertilized treatment], with or without wheat (Triticum aestivum L.) plants. Soil solutions were collected nondestructively with looped hollow fiber samplers from the root zone in situ six times during the 49-d growing period. Wheat plants were also collected at the second, fourth, and last collection date. Concentrations of NO 3 and K in the soil solution were significantly lower for the CAF treatment than for the ordinary fertilizer treatment at all sampling times. Leaching potential of N and K in the CAF treatment was accordingly reduced compared with the ordinary fertilizer treatment, especially at the early stages of plant growth. The concentration of P was low, and not affected significantly by the N treatments, and the leaching potential was negligible. Moreover, plant growth, nutrient uptake of N, P, and K, and their supplying mechanisms in soil were not affected significantly by the N treatments in this experiment. Therefore, the ability of CAF to reduce the leaching potential of soil nutrients without exerting adverse effects on the growth and nutrient uptake of plants was demonstrated for N and K, based on the dynamics ofthe soil solution composition in the root zone.