不同氮、磷、钾水平对水稻纹枯病的影响

Effects of Different Nitrogen,Phosphorus and Potassium Levels on Rice Sheath Blight

田间试验研究了不同氮、磷、钾水平对水稻纹枯病发生程度和产量的影响。结果表明,水稻纹枯病的发病率与N、P、K关系分别为:随氮肥施入量的增加,呈先缓慢上升,再大幅度上升的趋势;随磷肥施入量的增加,呈先小幅度上升,再大幅度下降,然后再大幅度上升的趋势;随钾肥施入量的增加,呈现大幅度下降,再大幅度上升的趋势。产量结果表明:不同氮、钾处理对水稻产量影响大,不同磷处理对水稻产量影响小。适用于寒地的施氮量97kg/hm2、施磷量52kg/hm2、施钾量29kg/hm2,使纹枯病发病轻,提高水稻产量。

The field experiment was conducted to study effects of different nitrogen, phosphorus and potassium levels on rice sheath blight＇s disease incidence and seed yield. The results showed that rice sheath blight increased slowly first, then significant rise by using nitrogen, increased slowly first, then significant decrease by using Phoshorus, increased significant decrease first, then significant rise by using Phoshorus nitrogen. The results of yield indicated that application rate （97 kg/hm^2）, phosphorus application rate （52 kg/hm^2） and potassium application rate （29 kg/bm^2） were used to rice in cold area. Rice sheath blight happened light, and it achieved to increase the yield.