迟播迟栽水稻适宜寄插规格的初步探讨

本试验通过对迟播迟栽水稻的秧苗素质、生育期及产量构成因素和产量的研究。结果表明：不同播栽期和寄栽规格的秧苗素质差异达极显著水平，迟播迟栽的水稻本田期缩短５－１０天。寄栽密度稀的秧苗素质优于寄栽密度大的。早播早栽有利于增加有效穗、着粒数、结实率和千粒重。寄栽稀的可以增加有效穗数，但穗子较小，千粒重随密度减小而增大。播栽期和寄栽规格对产量均有影响，但互作效应不显著。研究认为：适当地进行迟播迟栽，虽然获得的水稻产量相对偏低，但可以比常规栽培模式多收获一季玉米，可大幅度提高周年的粮食总产量。

PRELIMINARY STUDY ON SEEDLING DENSITY OF RICE UNDER LATE SOWING AND TRANSPLANTING CONDITIONS

The effects of different sowing dates and transplanting dates on the seedling quality, growing period, yield and yield components of rice were studied in paddy field. The results showed as follows. Late sowing date and transplanting date after harvesting maize reduced the growing period in paddy field and decreased the yield, grain number per panicle and effective paniclesper unit area. Though the yield of rice transplanted after harvesting maize decreased, the yield of maize could get much more. Therefore, the yield of crops for whole year is increased highly.