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小麦后期管理指的是从开花到成熟形成经济产量这段时间。此期小麦受环境条件和栽培条件的综合影响,所以掌握好小麦后期生育特点及对环境条件的要求,才能做到加强后期管理, 小麦开花后至“多半仁”时,如果土壤乾旱、天气乾旱或脱肥,不但影响千粒重,还会使部分籽粒退化,使穗粒数减少。过了半仁期,成穗数、穗粒数已成定局,千粒重则成了影响产量的决定因素。小麦籽粒中的乾物质80%以上是抽穗后绿色部分进行光合作用提供的。因此,加强后期管理是提高千粒重的关键。在管理上既要防止氮素代谢过旺而贪青,也要防止氮、磷不足而早衰。在正常条件下,管理得当千粒重能增2—3克,管
Post-wheat management refers to the time from flowering to maturity to produce economic output. In this period, wheat is affected by the combination of environmental conditions and cultivation conditions. Therefore, it is necessary to have a good grasp of the characteristics of post-harvest wheat and the requirements for environmental conditions so that post-management can be strengthened. When soil is dry and weather is poor Or fattening, not only affect the 1000-grain weight, but also make some of the grains degenerate, so that fewer grains per spike. After a half-kernel stage, the number of spikes and the number of grains per spike are a foregone conclusion, while the thousand-grain weight is the decisive factor affecting the yield. More than 80% of the dry matter in the wheat grain is provided by the photosynthesis of the green part after heading. Therefore, strengthening the latter part of management is the key to improving the 1000-grain weight. In management, it is necessary to prevent excessive nitrogen metabolism and greed green, but also to prevent nitrogen and phosphorus deficiency and premature decline. Under normal conditions, properly managed 1000 grain weight can increase by 2-3 grams, tube