The Research Of Machine-transplanted Rice Reproductive Characteristics And The Influence Of Machine-transplanted Rice Yield With Combined Application Of N, P And K

The experiment was conducted in Rice Foundation Seed Farm which belongs to Huainan City, Anhui Province and Fengtai County during2009to2010. We take the middle japonica rice such as Wan rice No.68,Ning japonica No.4,Xu rice No.3and Xu rice No.5as test materials, to carry out the research of machine-transplanted rice reproductive characteristics and the influence of machine-transplanted rice yield with combined application of N, P and K, the results are as follows:1.Compared with conventional hand-planted rice, machine-transplanted rice late planted and late sown, resulting in its each growth period were postponed, the whole growth period shorten about10-15d than conventional hand-planted rice, the short period is mainly in vegetative growth stage but little difference in reproductive growth stages.2.Hand-planted rice and machine-transplanted rice have different transplanting seedling ages, hand-planted rice sowing is thin, seedling transplanting with tiller which rate is70-80%, while machine-transplanted rice sowing is thick, tillering rarely occur during nursery stage, transplanting when leaf stage is small, mechanical damage on the seedlings when planting, live seedling is slow and the revival time is long. The spike joint position of machine-transplanted rice is relatively concentrated in the5-7.5leaf, belongs to medium tillering, which become to big spikes is more difficult than conventional hand-planted rice.3.Machine-transplanted rice has different production levels and its dry matter accumulation showed different characteristics,700kg high yield field and650kg plots have rather close LAI in various growth stages, the total dry matter production has little difference before full heading stage. From full heading to maturity700kg or more plots per acre new dry matter production is626.8kg,650kg plots per acre new dry matter production is589.0kg.700kg or more yield field per acre number of spikelets is more than29.5million, while650kg or so plots per acre number of spikelets is about28million. High storage capacity improves grain filling earlier stage leaf photosynthetic production capacity, promotes leaf senescence, resulting in abatement speed of LAI obviously faster than650kg plots after full heading stage.4.Application of different proportions of N, P and K fertilizer which have great influence on rice yield, treatment of6and7have the highest yield. Treatment6of the high yield field per acre actual output is776.3kg, which is the highest yield of each treatment. Output of no-fertilizer area (treatment1) and N-free area (treatment2) are lower, per acre yield is448.4kg and462.7kg respectively, which lower73.02%and67.91%than treatment6relatively; Treatment6of the middle yield field per acre actual output is701.3kg, which is the highest yield of each treatment. Output of no-fertilizer area (treatment1) and N-free area (treatment2) are lower, per acre yield is410.4kg and447.1kg respectively, which lower70.9%and51.07%than treatment6relatively.