水稻无氮基础地力研究初报

The effect of soil fertility without nitrogen fertilizer on rice yield

通过水稻无氮基础地力试验,研究了江苏沿江高沙土地区水稻无氮基础地力产量及潜力。结果表明:不施氮肥对水稻生长有明显影响,对比施氮处理,无氮区水稻株高降低,茎蘖减少,高峰苗减少,穗数少,穗形小,虽结实率提高,千粒重增加,但最终产量仍明显下降。该区水稻无氮基础生产力平均为4 620 kg/hm^2,土壤供氮量77.25~82.50 kg/hm^2,平均为80.25 kg/hm^2。

Field experiments with rice were conducted to study the rice yield and production poten- tial on the sand soil of Jiangsu riparian area under no application of nitrogen fertilizer. The results showed that no application of nitrogen fertilizer had an obvious influence on rice growth, the rice was less in plant height, tiller number, peak seedling number, spike number and spike body, and thus the rice yield significantly decreased though the seed setting rate and 1 000-seed weight were higher than those under nitrogen fertilizer application. Under no application of nitrogen fertilizer the rice yields on the sand soil of experimental area were averagely 4 620 kg/hm2 ,and the nitrogen supply of the soil was 77.25 - 82.50 kg/hm2 , averagely 80.25 kg/hm2. The above results could be used as reference for application of nitrogen fertilizer to rice fields of the sand soil of Jiangsu riparian area.