随着美洲大蠊卵荚历期的增加，啊氏啮小蜂发育历期逐渐缩短。
Development period of the parasitoids was shortened when hostal egg age rised.
论述了大豆多生长中心作物的表征和荚粒发育及其在群体冠层中分层构成产量的一般规律。
This paper deals with crop's apparent features of multi growth center, and the basic law of pods grain development in different layers of soybean canopy.
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