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1976—1978年,我们应用稳定性同位素~(15)N 研究广东省两种主要水稻上(广东丘陵红壤和珠江三角洲冲击围田水稻土),几种水稻品种(广二安、二白矮、台珍和秋二矮)对碳铵和尿素的利用率及氮肥增效剂提高氮肥利用率的试验。试验结果表明:水稻对碳铵的利用率为20—30%,对尿素的利用率为40—45%。同一水稻品种不同的生育期,不同品种之间,不同土壤条件等对氮肥碳铵和尿素的利用率有较大的差异,如“广二安”和“二白矮”对碳铵的利用率分别为24.74%和21.18%。广东丘陵红壤较瘦瘠,含氮量低,水稻对碳铵的利用率
From 1976 to 1978, we studied two major rice varieties in Guangdong Province (hilly red soil in Guangdong Province and paddy soil in the Pearl River Delta impact area) using stable isotopes of ~ (15) N. Several rice varieties (Guang’ian, Taipei, Taipei, Taipei, Taiwan) and utilization of ammonium bicarbonate and urea and nitrogen fertilizer to improve nitrogen utilization efficiency of the experiment. The results showed that the utilization rate of ammonium bicarbonate in rice was 20-30% and that of urea was 40-45%. The same rice varieties at different growth stages, different varieties, different soil conditions and other ammonium nitrogen ammonium fertilizer and urea utilization rates are quite different, such as “Guang Er’an” and “Erbai short ” on the carbon Ammonia utilization rates were 24.74% and 21.18% respectively. Guangdong hilly red soil is relatively thin barren, low nitrogen content, ammonium utilization of rice