不同种植密度对晶甜5号超甜玉米农艺性状及产量的影响

The Effect of Planting Density on Agronomic Characteristics and Yield of Jingtian No.5 Super-sweet Corn

研究了不同种植密度对晶甜5号超甜玉米农艺性状及产量的影响。结果表明:晶甜5号在种植密度4.2×104～6.0×104株·hm-2范围内,随着密度的增加,鲜果穗重逐渐下降,但每公顷产量逐渐增加;从生育期和穗部性状上分析,随着密度的增加,晶甜5号采收期提前,生育期缩短,株高、穗位升高,但穗部性状变差,穗长逐渐缩短,穗粗变细,穗行数先增加后减少,秃尖长先变短后增长,行粒数和穗粒数逐渐减少。由此表明,南京地区秋季超甜玉米晶甜5号的最佳种植密度为6.0×104株·hm-2。

The paper explores the effect of different planting density on agronomic characteris- tics and the yield of Jingtian No. 5 super-sweet corn. The results show that the fresh ear weight decreases while the yield increases with the increasing density under different density such as 4.2×10^4, 4.8×10^4, 5.4×10^4, 6.0×10^4 plants · hm-2. As for the growth process and ear characteristics of Jingtian No. 5, the harvest time is advanced and the growth period is shortened in the density of 6.0 × 10^4 plants ·hm-2; and the plant and ear height are raised. But the ear characters become worse, the ear length becomes shorter and the ear diameter be- comes more tapering~ the ear row number increases first and then decreases while the length of bald tip decreases first and then increases. The kernels per row and grains per ear decrease. Comprehensive research shows that the best planting density for autumn Jingtian No. 5 super- sweet corn is 6.0×104 plants ·hm-2 in Nanjing.