郑单958玉米品种栽培密度研究初报

Preliminary Report on Corn Variety "Zhengdan 958" Planting Density

对玉米品种"郑单958"不同种植密度试验结果表明:"郑单958"种植密度在90 000株/hm2时,产量最高,此时玉米的株高、穗位、穗长、穗粗、穗粒数、百粒重、抗逆性等方面都比较适宜,有较高的增产潜力。低于或超过这一密度,产量均有所下降,密度较低时,玉米果穗大、单穗粒重较高,但穗数偏少,产量达不到最高值;密度较大时,果穗变小,秃尖较长,空秆增加,抗逆性下降,单穗粒重下降,产量也不能达到最大值。

An experiment on different planting densities of corn variety ＂Zhengdan 958＂ was carried out. The results showed that a highest yield was achieved when the planting density was at 90,000 plants/hm2 meanwhile the plant height, ear position, ear length, ear diameter, the grain number per spike, hundred grain weight and stress resistance were all relatively suitable and the potentiality of yield increasing was high. The yields would decrease when the planting densities were lower or higher than that density. When the planting densities were lower, the ear of corn was larger and single ear grain weight was higher but the number of ear was lesser and the yield could not reach the highest. When the planting densities were higher, the ear became smaller, bald tip was relatively longer, empty straw increased, stress resistance decreased and single ear grain weight decreased and the yield could not reach the highest.