Effect Of Bulk Blending Controlled Release Fertilizer On Lodging Resistance Ability And Yield Of Daohuaxiang-2 In Cold Area

Lodging is the key factor of the production of limited cold-area qualified rice Daohuaxiang-2(Wuyoudao-4),while the optimization of fertilization are the main measures to improve lodging resistance.During two consecutive years of testing from 2015 to 2016,three kinds of nutrition management of Farmer-fertilization practice(FFP),Integrated nitrogen management(INM),and Bulk blending controlled release fertilizer(OPT),are set up to study the effects of various management methods on the morphology and mechanical characteristics of this kind of stalk and the chemical composition of the stalk to discuss the effects of nutrition management in improving the lodging resistance of rice plants.The main results are as follows:In each nutrient management,applying of Bulk Blending Controlled Release Fertilizer can improve the allocation of basal internode,shorten the length of basal internode,and promote the filling of basal internode.Applying of Controlled release mixed fertilizer can contribute enrichment of basal intenode.In 2015,length of the basal 1st internode(I1)and basal 2nd internode(I2)in OPT are respectively reduced by 28.8%(p<0.05)and 15.5%(p<0.05),compared with that of the FFP.In 2015 and in 2016,plumpness of OPT and INM are respectively increased by 18.5%(P<0.05)and 18.5%(p<0.05).Integrated nutrition management and controlled release mixed fertilizer can increase the content and proportion of K in basal internode.The content of K in the I2 of INM was increased by10.5%-21.7%(p<0.05)compared with FFP,while the ratio of K and N was increased by 16.9%(p<0.05)on average.Bulk Blending Controlled Release Fertilizer can increase the ratio of K and Nin I2 in basal internode.Bulk Blending Controlled Release Fertilizer and integrated nutrient management can enhance the mechanical strength of basal internodes,and reduce lodging index,INM can control the actual occurrence of lodging in the field.During two years of testing,the breaking resistance(BR)of INM was increased by 21.3%-28.5%(p<0.05)compared with FFP,while that of OPT was increased by28.96%-23.32%(p<0.05)compared with FFP.BR show significantly or very significantly positive correlation with the plumpness and content of K in I2,when showing significantly or very significantly negative correlation with lenth of each basal internode.In two years,the field lodging rate of INM was decreased by respectively 57.4%-100%(p<0.05),while OPT was increased by72.4%-267%(p<0.05).In addition,lodging rate from survey area was increasd by 20.5-66.7percentage points,compared with FFP.Reducing fertilizer on the accumulation amount of dry matter of stalk has significant promotion functions,while integrated nutrition management has a positive effect on the harvest index.The accumulation amount of dry matter of OPT was increased by 12.9%-15.7%(p<0.05)respectively,compared with FFP in two years.The controlled-released fertilizer and Integrated nitrogen management can play a role in increasing production.During the two years of experiment,INM and OPT were increased by 7%(p<0.05)and 9.2(p<0.05)on average compared with FFP.INM can increase yield by promoting large panicle or by increasing 1000 grain weight,while the increase of OPT production was mainly caused by the increase of effective panicle number and grain weight.It can be obtained by the comprehensive test results: after the treatment by integrated nutrition management,K content of I is relatively high,with a better Plumpness of internodes,while the lenth of two basal internodes are appropriate,BR of rice stalk improves significantly appropriate,and the occurrence of rice stalk reduces,while the rice yield increases significantly.The application of controlled-release fertilizer can promote rice stalk enrichment,and increase lodging resistance ability,but the fertilizer produced due to the floating of controlled fertilizer is uneven distributed and has high yield,while the application of controlled release fertilizer cannot significantly reduce rice lodging.Comprehensive management of nitrogen fertilizer has the effect to improve lodging resistance of Daohuaxiang-2,and can achieve high yield and high efficiency.The application of controlled-release fertilizer has increased ear-bearing percentage of tillers and the panicles in harvest,while increasing the filling rate and 1000-grain weight.