春谷早熟区谷子种植密度对植株性状及产量的影响研究

为了确定谷子合理的种植密度,为农业生产提供理论依据,通过采用小区试验、方差分析和非线性回归的方法对密度与谷子植株性状及产量关系进行了研究。结果显示,种植密度对谷子的性状及产量均有明显影响,随着种植密度的加大,谷子植株的株高降低、穗长变短、茎粗变小、全重、穗重、穗粒重都有减少的趋势,产量呈现先增后降的趋势,适宜种植密度为33万株/hm2~42万株/hm2。通过SPSS曲线回归得出二次曲线模型y=b0+b1x+b2x2为描述春谷早熟区谷子种植密度与产量的关系的最优模型,本试验‘大同29号’的方程式为y=1541.272+286.622x-3.632x2,计算得出理论最适密度为39.4579万株/hm2,与实测值相吻合。本试验得出了春谷区谷子密度预测模型,该模型适应于春谷早熟区常规种种植密度、产量的预测,但是否适宜全国不同生态条件的所有谷子品种的预测,需进一步深入研究。

Study about Effects of Planting Density on Traits and Yieldof Millet Plant of Early spring millet Area

Objective] In order to determine the reasonable planting density of millet, and provide a theoretical basis for agricultural production, Method] the research methods was by plot test, variance analysis and nonlinear regression. Result]It showed that planting density had obvious effect on millet traits and yield , with the increase of planting density, millet plant height was reduced, spike length was shortened , stem diameter became smaller, total weight, ear weight, grain weight per ear were reduced, production was firstly increased and then decreased. The suitable planting density was of 22000 plants per mu to 28000 plants per mu. Through SPSS regression curve analysis, we thought that quadratic curve model y=b₀ b₁x b₂x₂ were the optimal model to describe the relationship between millet planting density and yield. The predicted equation of Datong No. 29 in premature district of spring millet was y=102.751 286.622x -54.48x₂. Using the equation, we concluded that the theoretical optimum density was 26305 plants per mu .This theoretical value was in agreement with the measured values. Conclusion] The millet prediction model which was made by the experimental results is suitable for early maturing area conventional planting density and yield prediction.. But it need further study that the prediction model"s suitability for all the varieties of Foxtail Millet of different ecological conditions in the country.