Effects Of Straw Mulching On Growth,Development And Yield Of No-tillage Direct Seeding Late Rice

Indica conventional rice variety Zhongzao 39 as experiment material,in no-tillage with straw mulching mode to carry out the test analysis of yield and yield components,Total biomass,agronomic traits in seedling stage and nitrogen use efficiency,in order to optimize the no-till rice straw mulching mode live cultivation techniques.The main research results are as follows:1.Compared with not straw mulching,W2S5 processing of rice yield up to 7.01 t/hm2,straw mulching treatment rice yield increase by an average of 6.9%(1.1%~12.8%),mainly by increasing the effective panicles per unit area,grain number per panicle and grain weight.With low rate not compared nitrogen treatment(M1N1),M4N3 processing of rice yield up to6.86 t/hm~2,increase rate and nitrogen processing rice yield increase by an average of 21.4%(6.2%~36.4%),mainly increase the effective panicles per unit area and the spikelet numbers.2.Straw mulching and soil retention highly and could significantly increased high total biomass accumulation.Soil retention(W2)of total biomass accumulation than CK(W1)increased by an average of 5.5%,straw mulching treatment of total biomass accumulation than no cover(S1)increasing by an average of 15.5%(10.7%~24.5%).Rate increase total biomass quality significantly increase the mature period,increased by 6.2%~12.7%,and harvest index increased with the increase of seeding rate declined;compared with no nitrogen,nitrogen total biomass of nitrogen application weight and harvest index were higher,14.1%~18.9%;Under the action of seeding rate the same as the nitrogen fertilizer,total biomass weight and harvest index were 1375.10 g/m~2(M4N3)and 50.28%(M2N2)is the highest.3.The straw mulching and soil retention of rice seedling agronomic traits between have a significant impact.Soil retention and straw mulching main influence of rice seedling plant height,root length and stem weight,the effect of plant height W1S3 is the highest(31.10cm),the longest root length is W1S2(14.90 cm)stem is heaviest weight W1S3(0.49 g/plant);Compared with no cover,straw mulching significantly increased rice seedling plant height and stem weight,significantly reduced root length.4.Compared with not straw mulching,total nitrogen assimilation(TNA)increased with the increase of straw mulching quantity presents the downward trend after increase first,S4(4500 kg/hm2)deal with the highest;internal utilization efficiency of nitrogen(IE),partial factor productivity of applied nitrogen(PEP)and nitrogen harvest index,respectively(NHI)with S5 deal with highest,38.56 kg/kg,46.75 kg/kg,66.74%.Compared with no nitrogen,nitrogen processing rice plants was significantly increased by 51.1%~53.5%of total nitrogen assimilation(TNA).M4N2 treatment nitrogen agronomic efficiency(NAE),nitrogen recovery efficiency(NRE),partial factor productivity of applied nitrogen(PEP)is highest,14.72 kg/kg,respectively,32.54%,74.01 kg/kg.