以双季早稻陆两优996和晚稻Y两优86为试验材料,在高产栽培条件下,研究了3种密度和3种栽插苗数的互作模式下水稻群体冠层生理生态特性和产量。结果表明:早晚稻栽插苗数对光合速率的影响要大于密度及两者互作的影响|冠层太阳光截获率早稻以D45B3最高,晚稻则以D22B2最高|早稻齐穗期和乳熟期群体冠层太阳光截获率随栽插密度的增大而增大,晚稻则随密度和栽插本数的增加而增加|且在高温季节其冠层温度要低于其他处理,相对湿度则增加。早晚稻产量均随密度和栽插苗数的增加而增加,但密度或栽插苗数超过一定值后产量反而下降,早晚稻最高产量分别为9 681.19,10 512.70 kg/hm2。在本试验条件下:早稻在移栽密度33万穴/hm2的基础上配合3个栽插苗数,晚稻移栽密度为26万穴/hm2和1个栽插苗数能发挥高产潜力,获得高产。
A field experiment was conducted with different transplanting densities(45×104,30×104,22×104 hills/ha for early rice;30×104,22×104,16×104hills/ha for late rice) and number of seedlings per hill(4,3,2 for early rice and 3,2,1 for late rice) by using Luliangyou 996(early rice) and Yliangyou 86(late rice) as the ex-perimental materials on the basis of cost-saving cultivation. The result showed that the effect on photosynthetic rate were that the number of seedlings per hill were higher than the transplanting densities than their mutual effects,the early and late rice couldget the high value of photosynthetic rate and solar radiation interception rate of canopy at 45×104hills/ha,3 see-dlings per hill for early rice and 22×104hills/ha,2 seedlings per hill for late rice. The treatment for early rice with 45×104hills/ha and 3 seedlings per hill had a significant reduction of rice canopy tem-perature in hot season,the treatment for late rice with 22×104hills/ha and 2 seedlings per hill could add canopy temperature in cool sea-son. The increase in transplanting density and planting seedlings per hill rate improved the yield of early and late rice but the transplanting densities or planting seedlings exceeds a certain value the yield would decline. The opti-mal transplanting densities and planting seedlings for double-season early rice was respec-tively with 33×104hills/ha and 3 seedlings per hill and 26×104hills/ha and 1 seedling per hill for late rice could obtain high yield.
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