氮素与密度对砂姜黑土地区晚播小麦产量的影响

针对淮北砂姜黑土地区晚播小麦产量低而不稳的现状，在选用优良品种的基础上，系统研究了氮素供量和基本苗与产量形成的关系。结果表明：１１月下旬播种，皖麦２５和阜８６１两品种均可获得每公顷５７００～６０００ｋｇ的产量。主要措施为基本苗控制在３７５～４３５万／ｈｍ２，氮素施量１５０ｋｇ／ｈｍ２左右。氮素施量和基本苗与产量均呈二次抛物线关系。明确了晚播麦高产应适当加大基本苗，走以主茎成穗为主的途径。

Effect of Nitrogen and Planting Density on Yield of Late-seeding wheat in Shajiang Meadow Soil in Huaibei Area

In order to solve the problems of unstable and low yield of late-seeding wheat in Shajiang Meadow Soil in Huaibei Area,Fine whert cultivars were selected,and the relationship of the amount of Nitrogen application and planting density with yield formation was systematically studied.The results showed both of two wheat varieties (Wanmai 25 and Fuyang 861)can obtain the yield of 5 700-6 000kg/ha as the sowing dete was in the late of November,The main measures was as follow:the basic seedlings was limited among 375×10 4-435×10 4/ha and the amount of nitrogen applied was about 150 kg/ha.The amount of N applied and the basic seedlings were in relation of quadratic curved lines with grain yield.The techniques of high yield of late-seeding wheat was the suitable increasement of basic seedlings.