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玉米是陕西省旬邑县的主要粮食作物,为探索玉米新品种陕单609在渭北旱塬春玉米区的最佳种植密度,充分挖掘该品种的增产潜力,2011~2013年该县连续3年设计5种不同种植密度进行试验研究。结果表明:陕单609种植密度从4 000株/667m2增加到5 000株/667m2,随着密度的增加玉米产量逐渐提高,种植密度为5 000株/667m2时产量最高,为955.3kg/667m2,之后随着密度增加,产量逐渐降低;植株主要农艺性状随着密度的增加,株高和穗位升高,茎粗明显变细,双穗率下降,倒伏率增大,穗长、穗粗、穗行数、行粒数和千粒重均呈减少趋势。得出该地陕单609旱作地膜栽培的适宜密度应为4 500~5 000株/667m2。
In order to explore the optimal planting density of Shandan 609, a maize variety, in spring maize area of Weibei Arid Plateau, and to fully tap the yield potential of this variety, maize was the main food crop in Xunyi County of Shaanxi Province. From 2011 to 2013, Five different planting densities were designed and tested. The results showed that the planting density of Shaandi 609 increased from 4 000 to 6600m2 / 667m2. With the increase of density, the yield of maize increased gradually. The highest yield was 955.3kg / 667m2 when the planting density was 5 000 plants / 667m2, With the increase of density, the yield decreased gradually. With the increase of density, the plant height and ear position increased, the stem diameter decreased, the rate of double ear decreased, the rate of lodging increased, The number of rows per ear, grain number and 1000-grain weight showed a decreasing trend. It is concluded that the suitable density of Shandan 609 for dry film mulching cultivation should be 4 500 ~ 5 000/667 m 2.