马铃薯源的供应能力与库容量的关系

马铃薯茎叶和块茎增长过程有两个平衡期 :鲜重平衡期和干重平衡期。二者出现的早或迟、平衡值的高或低受密度和施肥调控 ,从时间和空间上反映了源库是否协调 ,也反映了源库间相互制约、相互促进的关系 ;薯数 /m2 叶和薯重 /m2 叶可用来表示单位叶面积上负荷量和有效生产量的大小 ,在一定程度上反映了源的数量与质量、库对源的调运能力、反馈及流的畅通程度 ;不同密度和施肥处理下 ,马铃薯产量随群体库容量和源供应量的增加而增加 ,在一定范围内随库 /源比值的提高而提高。试验结果表明 :库 /源比值以 0 4 2 8为宜 ,此时 ,马铃薯品种底西芮的经济产量可达到 30 0 0kg/6 6 7m2 以上

CORRELATION OF SOURCE ACCOMMODATION AND SINK VOLUME OF POTATO

There were two balance stages during tuber increase and leaf increase,i.e. balance of fresh weight and dry weight. Whether the two stages occurred early or late, and the balance value was high or low were controlled by plant density and fertilizer application. These reflected if the source-sink was harmonic in time and space. Also, these reflected the interaction of source and sink. Tuber number/m~2 leaves and tuber weight/m~2 leaves can show the burthen and production efficiency on the basis of leaf area per unit area, and to some extent reflect the quantity and quality of source and the ability of sink regulation. Under different plant densities and fertilizer regimes, potato yield increased with increase in sink capability and source supply, and to some extent increased with sink/source ratio. The experimental results indicated that the optimum sink/source ratio was 0.428 and the yield could reach more than 3000 kg/667m~2.