依据玉米生长发育进程与最佳季节同步原理，建立了玉米适宜播期确定知识模型。
The knowledge model for suitable sowing time is based on the synchronization between the maize growing process and the suitable season.
本试验采用播期与栽培密度两因素的裂区设计，以确定沙地菊芋种植的较佳密度和适宜播期。
The assay use split plot design on two factors, including the date of seeding and density, to define the better density and most suitable date of seeding on sand Jerusalem artichoke.
因此选择适宜播期、提高渐增期灌浆速率、快增期灌浆速率和平均灌浆速率对提高粒重有重要意义；
The rate of average grain filling, the rate of grain filling during gradual increase stage, and the grain filling rate of rapid increase stage had important contribution on increasing grain weight.
适宜播种密度和播期有利于土壤水分的优化利用和水分利用效率的提高，可促进旱地马铃薯增产。
The suitable planting density and time of sowing are favor of optimum use of soil water and improving water use efficiency, and make potato increasing its output.
实践表明，只要播区、播期选择适宜，该区飞播油松成林面积可望占30%左右。
The practice showed that the forest area may account for about 30%of the total sown area, so long as the Suitable sown area and sowing time are chosen.
实践表明，只要播区、播期选择适宜，该区飞播油松成林面积可望占30%左右。
The practice showed that the forest area may account for about 30%of the total sown area, so long as the Suitable sown area and sowing time are chosen.
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