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在大田条件下,对不同磷酸二铵施用量下超高产和普通大豆品种的根系干重、根系总长度、根系直径、根系表面积、根系体积、根尖数、产量及倒伏指数进行了比较研究。结果表明:在全生育期,除大豆根系直径外,其他根系形态指标都呈单峰曲线变化;适量的磷酸二铵可显著提高大豆植株根系干重、根系总长度、根系直径、根系表面积、根系体积和根尖数,其中超高产大豆品种根干重上升幅度更大;根系形态指标的提高有利于促进根系干物质积累,提高产量。不同施肥处理对超高产大豆品种倒伏指数影响较小,超高产大豆品种在不同施肥处理下产量显著高于普通大豆。
Under field conditions, the root dry weight, total root length, root diameter, root surface area, root volume, root tip number, yield and lodging index of super-high-yield and common soybean varieties under different DAP treatments were compared. The results showed that during the whole growth period, except for the diameter of soybean root, the morphological indexes of other roots showed a single peak curve. The appropriate amount of DAP could significantly increase the root dry weight, total root length, root diameter, root surface area, root system Volume and number of root tip, among which, the root dry weight of super-high-yielding soybean varieties increased more greatly. The improvement of root morphology index was beneficial to promote the accumulation of root dry matter and increase the yield. Different fertilizer treatments have little effect on the lodging index of super-high-yielding soybean varieties. The yield of super-high-yielding soybean varieties under different fertilizer treatments was significantly higher than that of common soybean.