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研究采用盆栽试验方法,研究了不同水氮条件对油菜生物量及其地上、地下分配的影响。结果表明:油菜生物量与氮肥用量、灌水控制水平关系极为密切,且水肥交互效应明显。油菜生物量随着氮肥用量的增加而增加,但超过某一氮肥用量后,则表现为下降的趋势;随灌水控制水平的变化亦表现出相同趋势。水、氮供应适宜,有利于新鲜植株保持较高的水分含量,植株根冠比适中,有利于获得较高的可食部分产量。综合考虑,灌水水平控制在田间持水量的80%、施氮量为0.24g kg-1土的组合是最优的。上述结果可为蔬菜的高产、合理灌溉和施肥提供理论依据。
Pot experiments were conducted to study the effects of different water and nitrogen conditions on rapeseed biomass and its distribution above and below ground. The results showed that the biomass of rapeseed was closely related to the amount of nitrogen fertilizer and irrigation control, and the interactive effect of water and fertilizer was obvious. The biomass of rapeseed increased with the increase of N application rate, but it declined after more than a certain amount of nitrogen fertilizer applied. The same trend also appeared with the change of irrigation control level. Appropriate water and nitrogen supply is conducive to maintaining high fresh water content of plants, plant root-to-shoot ratio is conducive to obtaining a higher yield of edible part. Taken together, the control of irrigation levels in the field of water content of 80%, nitrogen application rate of 0.24g kg-1 soil combination is the best. The above results provide a theoretical basis for high yield of vegetables, reasonable irrigation and fertilization.