【摘要】 以太湖地区的常熟市为试验区,选择不同土壤类型的农田,设置不同氮肥水平田间小区试验与微区试验,对稻麦轮作下作物产量的氮肥效应及田间适宜施氮量进行了研究。结果表明,无论是水稻,还是小麦,随施氮量增加,作物氮肥农学利用效率均下降。2年多点田间试验结果显示,该地区水稻的区域平均适宜施氮量为(176±24.2)kg.hm-2,小麦为(228±27.1)kg.hm-2。研究结果还表明,在该地区大义黄泥土上,水稻(品种4007)兼顾生产、生态和经济效益比较合理的施氮量为171~204 kg.hm-2。更多还原

【Abstract】 To investigate the effect of N application rate on crop yield and the optimal nitrogen fertilizer application rates to rice-wheat rotation system in Taihu Lake Region,several field experiments and micro-plot experiments were conducted with different N application rates under different soil species and crop cultivars in Changshu City.The results obtained were as follows.No matter rice or wheat,agronomic efficiency of applied N decreased rapidly with the increased N rates.The results from five field experiments in two years evidenced that the regional optimal nitrogen fertilizer application rate of rice was at(176±24.2)kg·hm-2,and of wheat at(228±27.1)kg·hm-2.The ecological and economical satisfactory application rate of nitrogen fertilizer on rice(cultivar 4007)ranged within 171-204 kg·hm-2 on Dayi Huangni soil in Taihu Lake Region.更多还原