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《Jiangsu Journal of Agricultural Sciences》 1987-03
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STRUCTURE OF PODDING LAYERS IN RAPE (BRASSICA NAPUS L.)

Zhu Gcngru and Deng Xiulan (Department of Agronomy, Jiangus College of Agriculture, Yangzkou, Jiangsu Province)  
Mature rape pods were sampled layer by layer at intervals of 10 cm in the crop canopy from 76 fields of 3 sites in north Jiangsu in 1979-82, and their economic characters examined. It was found that the pods in the middle and upper layers had the best economic characters.The lower the pods were located, the poorer they were in economic characters. The productivity of pods in the podding layers was affected not only by the order of anthesis, but to a greater extent by the illumination condition in different positions. The productivity per unit pericarp area (PPA) of pods in the upper and middle layers was higher than that in the lower layers. PPA decreased with the increase in accumulative pericarp area indexes (PAI), which may be described by a quadratic equation. The upper limit to PAI was 5 in Yangzhou city and 6 in Suniing County. The productivity of the pods on primary branches was related to the position and length of infructescences. The podding layers are preferably to consist mainly of the main stem and primary branches which have fairly long infructescences and start podding nearly at the same height, thus forming a thick and productive podding sectiton in the crop canopy.
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