种薯重量对旱地马铃薯生长发育及产量的影响

在内蒙古阴山北部丘陵区半干旱条件下，通过田间试验研究了不同重量种薯对马铃薯生长发育及产量的影响。结果表明：在干旱条件下，马铃薯植株生长发育、主茎数及块茎产量与种薯重量有着十分密切的关系。在一定范围内，随种薯重量的增加，每穴茎数相应增加，植株表现生长旺盛，单位面积产量呈上升趋势，净产量则随种薯重量的增加呈下降趋势。以５０～７５ｇ种薯净产量最高，达９２８０．５～８０３１．０ｋｇ／ｈｍ２，商品薯率较高，经济效益最佳，种薯重量≥３００ｇ，净产量最低，仅３２２５．０ｋｇ／ｈｍ２，经济效益最差。

THE EFFECT OF SEED TUBER WEIGHT ON GROWTH, DEVELOPMENT AND YIELD OF POTATO

The field experiments were carried out under the semiarid dry conditions in the north of I nner Mongolia in order to investigate the effect of seed tuber weight on growth,development and yield of potato.The results showed that the weight of seed tuber was closely related to potato growth and development,numbers of main stem and tuber yields under dry conditions.In the experiment,numbers of stem per hole and tuber yield increased appropriatly with raising of seed tuber weight,while net yield was tending to decline.The net yield whose seed tuber weight ranging 50 to 75g was the highest and its yield was 9280 5～8031 0kg/hm 2 ,and its market tuber rate and economic benefit were relatively high.The net yield whose seed tuber weight no less than 300g was the lowest which yielded 3225 0 kg/hm 2,and economic benefit was the lowest.