Effects of Nitrogen Management on Growth and Development,Soil Physical and Chemical Properties of Late-Season Rice under Different Straw Retention Treatments of Early-Season Rice in Direct Seeding Mode of Double-Season Rice
The aims of this study were to explore effects of different straw retention practices of early-season rice(ESR)and nitrogen(N)management of late-season rice(LSR)on growth and development of LSR and soil physical and chemical properties in direct seeding of double-season rice(DS-DSR).The experiment was arranged in a split-plot design with N application ratio and straw retention practices.Under the total nitrogen application of 150 kg/ha in LSR,two different N application ratio were set as main plots,which was N1(base fertilizer∶tillering fertilizer∶panicle fertilizer=1∶1∶1)and N2(base fertilizer∶tillering fertilizer∶panicle fertilizer=2∶1∶1).Five straw retention practices were set as subplots,including straw retention(SR),straw retention with liming(SR+L),straw retention with straw decomposing inoculant(SR+S),straw retention with liming,straw-decomposing inoculant(SR+L+S),and no straw retention(CK).The results showed that SR decreased seeding quality and soil pH of LSR compared to CK treatment.However,the treatment of SR+L accelerated straw decomposition rate of ESR,and increased soil available K content of LSR.Meanwhile,N2 application level increased the emergence rate and seedling quality of LSR,alleviated the adverse effects of straw retention in the short period.In addition,the treatment of SR+L and N2 synergistically increased the soil pH of LSR.Thus,SR+L and N2 synergistically increased the yield of LSR by 8.4％.The adverse effects of straw of ESR on LSR could be reduced by applying lime and increasing the amount of base fertilizer(N2)of LSR after the straw retention in the field,so as to increase the yield of LSR.
Direct seeding of double-season riceStraw retentionNitrogen managementLimeStraw-decomposing inoculant
NETL
NSTL
万方数据
