Study Of Density And Optimum Fertilization In Different Varieties Of Rice Tillering Capacity In Heilongjiang Province

We use three main rice varieties weak tillering ability Suijing No.4, medium Suijing No.9andstrong variety of Kendao12which are planted in the second accumulated temperature zone ofHeilongjiang province to complete the experiment. The test sets density (X1), nitrogen (X2), phosphorus(X3), the amount of potassium content (X4) of four factors and each factor has five levels. The computeris used to design two regression rotational combination. The results show that compact planting ofSuijing No.4led to spike number, grain number per panicle, seed setting rate, grain weight decreased;Excessive nitrogen will make the grain number per spike,1000grain weight, seed setting rate declined;Proper phosphate fertilizer increased grains per spike and yield; excessive application of potassicfertilizer will result in reduced in grain number per spike reduced and theoretical yield decreased.Excessive planting of Suijing No.9decreased panicle numbers and1000grain weight. Excessivenitrogenous fertilizer increased panicle numbers but grain number per panicle, seed setting rate,1000grain weight and yield decreased. The suitable phosphate fertilizer increased grain number per spike,1000grain weight, seed setting rate and yield. Potash fertilizer can increase the grain number per spike,1000grain weight, seed setting rate. Compact planting of Kendao12decreased panicle numbers, grainnumber and1000grain weight. The excessive application of nitrogen fertilizer plant height, flag leaflength, number of grains per spike decreased,1000grain weight decreased. The suitable phosphatefertilizer increased ear number, grain number per spike and yield. The suitable potash fertilizer increasedear number, grain number, seed setting rate one thousand grain weight and yield.When Suijing No.4reached the highest yield (9122.5kg/hm2), the optimum density, nitrogen,phosphorus, potassium is339000points/hm2,141.2kg/hm2,60.0kg/hm2and58.4kg/hm2respectively.When Suijing No.9reached the highest yield (9490.0kg/hm2), the optimum density, nitrogen,phosphorus, potassium is306000points/hm2,115.6kg/hm2,49.0kg/hm2,67.7kg/hm2respectively; Kendao12rearched the highest yield (9266.8kg/hm2), the optimum density, nitrogen, phosphorus, potassiumis277000points/hm2,92.36kg/hm2,37.5kg/hm2,75.8kg/hm2.When Suijing No.4rearched86.5points in eating quality, the optimum density, nitrogen,phosphorus, potassium is390000points/hm2,116.6kg/hm2,80.5kg/hm2,74.4kg/hm2. When SuijingNo.9gets83points in eating quality, the optimum density, nitrogen, phosphorus, potassium is332000points/hm2,93.3kg/,61.3kg/hm2,82.6kg/hm2.When Kendao12obtains84.8points in eating quality,the suggested density, nitrogen, phosphorus and potassium is305000points/hm2,70.0kg/hm2,50.3kg/hm2,90.9kg/hm2.Appropriatly increasing Suijing No.4planting density can improve the brown rice rate and milledrice rate.when the chalky rice rate, chalkiness degree increases, the eating quality declines. Excessiveapplication of nitrogen fertilizer will decline brown rice rate and milled rice rate.When chalky rice rate and chalkiness increased, the eating quality declines. The proper dosage of the P will decrease milledrice rate, chalky grain rate, chalkiness degree and increase amylose content. Proper potassium fertilizeramount is beneficial to improve the brown rice rate, milled rice rate, chalky grain rate, chalkiness, gelconsistency rate and good eating quality but amylose content decreased. Properly increasing Suijing No.9planting density can improve the brown rice rate, milled rice rate, chalky rice rate and qualitydecreased, but chalkiness, amylose content increased.Excessive nitrogen increased brown rice rate,milled rice rate, chalky grain rate, chalkiness.Phosphate fertilizer is beneficial to improve the brown ricerate, milled rice rate and decrease chalky rice rate, chalkiness, amylose content, gel consistency growth.Potassium fertilizer can improve the brown rice rate, milled rice rate and decrease the amylose content,gel consistency growth but eating quality increased. Appropriate increasing Kendao12planting densitycan improve the brown rice rate, milled rice rate, gel consistency, but the chalky rice rate, chalkinessdegree will increase. Excessive nitrogen fertilizer can reduce the brown rice rate, milled rice rate, butincrease chalkiness. The appropriate phosphate fertilizer helps to improve the brown rice rate, milled ricerate, the chalky rice rate and decrease chalkiness and gel consistency of growth, but the amylose contentincreased. The application of potassium fertilizer can improve the brown rice rate, milled rice rate, gelconsistency growth, eating quality, at the same time, chalky grain rate, chalkiness, amylose contentdecrease...