灰黄泥田早稻氮肥最佳施用量探讨

为找出灰黄泥田早稻氮肥最佳施用量 ,降低施肥成本 ,减少水质污染 ,于 1999～ 2 0 0 1年在永州开展了不同施氮量的试验。以无氮肥区为对照 ,在每公顷施用普钙 30 0 kg,氯化钾 15 0 kg为肥底的基础上 ,分别施用尿素态纯氮 6 0 ,12 0 ,180 ,2 40 kg,以金优 40 2为试验材料。结果表明 ,每公顷施纯氮 16 5 kg,可提早分蘖 ,增加有效穗数 ,且可增加株高和穗长 ,施肥量对产量的效应方程为 y =3378.6 30 .97x - 1.15 4x2。

Optimization of application rates of nitrogenous fertilizers in earlyseasoned rice planted in yellow podzolio paddy fields

Experiments of nitrogenous fertilizer application rates were carried out in Yougzhou, 1999~2001 in order to optimize the nitrogenous fertilizer application rates for early seasoned rice in the yellow podzolic paddy fields, reduce the fertilization cost and to alleviate the pollution of water. Kingyou 402 was used for experimental variety, 5 nitrogenous fertilizer application rates ranging from 0 to 240 kg pure nitrogen per hectare at the interval of 60 were designed on the basis of 300 kg calcium superphate and 150 potassium chloride per hectare.The test about the first rank amount of nitrogenous fertilizer on the yellow podzlio paddy fields has been done and results indicate: using 165 kg pure nitrogen each hectare can make the rice sprout ahead of time and increase the numbers of effective spikes and the height of an individual plant and the length of a spike.The equation is Y=225.24 30.97x-1.154x 2.