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Optimization of application rates of nitrogenous fertilizers in early-seasoned rice planted in yellow podzolio paddy fields

HE Zeng-ming (Agricultural Department of Yongzhou Vocational Technical College of Hunan, Yongzhou,Hunan,425001,China)  
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.
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