在江淮地区,苕子产种量不高,原因是苕子生长比較旺盛,茎叶相互挤压,下部容易腐烂,影响开花結实;苕子开花期,雨水偏多,湿度較大,往往造成花蕾大量脫落。我所曾經多次調查試验,对提高苕子产种量的技术作了一些摸索,現簡报如下: 一、选择土壤:肥田、水田苕子生长过旺,下部湿度过火容易腐烂;中等肥力的旱地不会造成这个現象,因此产种量較高。我所1962年在来安县广大公社广大大队调查,旱地亩产苕种六十八点七斤,水田亩产五十一点二斤,旱地比水田增产34.2%。二、适期播种:我所1962年試驗,10月中旬播种的。亩产苕种六十六点一斤,11月中旬播种的,亩产只有四十六斤,前者比后者增产43.7% 。証明适期播种苕子,既滿足它的生长发育,又不疯长影响结实,产种量高。三、减少播种量:播种过密,影响通风透光, In the Jianghuai region, razor clam production is not high, because razor growth is relatively strong, stems and leaves squeeze each other, the lower part of perishable, affecting the flowering and fruiting; raccoon flowering period, the rain is too much, the humidity is larger, often resulting Buds off a lot. I have repeatedly investigated and tested some techniques for improving the yield of Chinese prickly heat. I made the following briefing: I. Choosing the soil: Dry land does not contribute to this phenomenon, and therefore high yields. In 1962, we conducted a survey in a vast brigade in the commune of Laian County. The dry land mu production was 68.7 kg, paddy field mu production was 51 kg, dry land increased 34.2% over paddy fields. Second, the appropriate sowing: I test in 1962, sown in mid-October. Sixty-one kilograms of mu produce per mu, sowing in mid-November, only 46 kilograms per mu, the former yield 43.7% more than the latter. Prove the appropriate sowing seeds, not only to meet its growth and development, but not too long affect the firm, high yield. Third, reduce seeding: sowing too close, affecting the ventilation and light,