Effect Of Different Cultivation Pattern On The Yield And Economic Benefits Among Three Collocation Models With Early Season And Late Season In Double-Season Rice

In order to found out the effect of different cultivation pattern and collocation mode on the yield and economic benefit,field experiment was carried out in Qianshanghong Town,Datong Lake District,Yiyang City,Hunan Province in 2016.Based on 3 cultivation pattern---direct seeding,throw seedling and machine transplanting seedling,the paper was carried out a comparative study on rice yield,production cost and benefit of early rice-ratoon rice,early Indica rice&late Japonica rice model and early Indica rice&late Indica rice model,which was found out the best way of high yield cultivation pattern and cost saving and effectiveness increasing,and provide technical support for guiding local large-scale production.The main results were shown as follows:1.In the early rice-ratooning rice cultivation mode,rice yield of direct seeding by scatter was highest,up to 11.75t/hm²,followed by followed by the mechanical holl-drop direct seeding,next to few dense planting mechanical transplanting,strip direct seeding.The difference of rice yield was mainly the difference of effective panicle per m².But the order of economic benefits of that was mechanical holl-drop direct seeding>few dense planting mechanical transplanting>direct seeding by scatter>strip direct seeding.Compared with other cultivation pattern,output/input ratio,cost-benefit ratio and labor productivity in the mechanical holl-drop direct seeding was highest,and was 1.37,37.5%,388.1yuan·person^-1·d^-1,in addition,there was less investment of 21779 yuan/hm².Therefore,the mechanical holl-drop direct seeding was not only save labor and work,and high economic efficiency,which had a great development prospect of the Dongting Lake area in the future.2.In the planting model with“early Indica rice with late Japonica cultivar"Yongyou1540",yield with the combination of cultivation pattern“direct seeding by scatter in the early season&throw seedling in the late season”was highest,up to 18.33t/hm²,that of combination of cultivation pattern“strip direct seeding in the early season&traditional machine transplanting in the late season”was lowest.Mainly reason was highest effective panicle of direct seeding by scatter in the early rice,and highest No.spikelet per panicle of throw seedling in the late rice.In the aspect of economic benefit,in the planting model with“early Indica cultivar"Lingliangyou942"with late Japonica cultivar"Yongyou1540",economic benefit with the combination of cultivation pattern“few dense planting mechanical transplanting in the early season&throw seedling in the late season”was highest,up to 18641yuan/hm².Moreover,output/input ratio and cost-benefits ratio was also highest,was 1.64,64.4%,respectively.Because the input of few dense planting mechanical transplanting was less than that of direct seeding by scatter in the early rice,and high income of rice grain in the throw seedling for obtaining higher economic benefits in the late rice.3.In the planting model with“early Indica with late Japonica cultivar"Xiushui134",yield with the combination of cultivation pattern“direct seeding by scatter in the early season&traditional machine transplanting in the late season”was highest,up to 14.05t/hm².In the planting model with“early Indica with late Japonica cultivar"Xiushui134",economic benefit with the combination of cultivation pattern“few dense planting mechanical transplanting in the early season&tradition machine transplanting in the late season”was highest,was 8263yuan/hm²,output/input ratio and cost-benefits ratio was highest,was 1.29,29.3%,respectively.The reason was similar to that of early Indica and Japonica hybrid rice.4.In the two early Indica and late Japonica model,the yield of early indica rice with japonica hybrid rice was higher than that of early indica with late japonica rice,because of higher effective panicle per m² and no.spikelet per panicle;the economic benefit of the japonica hybrid rice model was larger than that of early indica rice with late japonica model because of its high grain yield.5.Annual yield of early rice-ratooning rice cultivation model was lower than that of two kind of early indica-late japonica model,because of shorten growth period and less dry matter accumulation.However,the early rice-ratooning model was beneficial with reducing labor force and the risk of cold venting.