不同播期对旱作谷子生长及产量的影响

目的研究旱作条件下不同播期对谷子生长和产量的影响。方法通过对谷子生育时期、叶面积、株高和叶、茎、穗干重以及产量指标的测定，确定谷子的最佳播期。结果随着播期的延迟谷子生育期变短；叶、茎随着播期的延迟生长速率变慢、衰退速率变慢；播种期过早谷子前期生长速率较快、播种晚的谷子后期生长较快；穗干重随着播期的延迟积累变快，千粒重随着播期的延迟呈下降趋势；穗粒数、籽粒产量和产草量均以5月23为播期最高。结论张家口地区谷子最佳播期为5月23日。

Effects of Different Planting Dates on Growth and Yield of Dryland Millet

Objective To study the effects of different planting dates on the growth and yield of dryland millet.Methods The optimal planting date was found out by determining the growth period,leaf area,plant height,dry weigh and yield of leaf,stem and spike.Results The growth period of millet was shortened with the delayed planting date.The growth rate and decline rate of leaves and stems were slowed when the planting date was delayed.The early growth rate of millet was rapid for early planting.The late growth rate was rapid for late planting.With the delayed planting date,the dry weight of spike was fasterly accumulated and the kilo grain weight declined,too.The grain number per spike,grain yield and grass yield were highest for the planting date on May 23.Conclution The optimal planting date of dryland millet is on May 23 in Zhangjiakou.