关键词: 张杂谷5号, 群体密度, 降水年型, 穴播, 产量

Abstract:

Millet variety Zhangzagu 5 (Z5) was used as a testing material under the film mulching and bunch planting condition. The experiment design was: 12 treatments which included three levels that were 4.95, 7.50, 15.00 ten thousands holes of per hm ² (TTH/hm ²) and four levels that were 1, 2, 3, 4 plants per hole (P/H). The effect of different annual precipitation and population density on tiller-earing and yield of millet were studied. Results showed that the relationship between yield and population density of Z5 was linear and platform correlated. Within the range of 4.75 to 11.97TTH/hm ², millet yields increased with population density linearly, within the wide range of 13.56-47.25TTH/hm ²,the response of yield was insensitive to population density and fluctuated in a narrow platform range. When the population density differed 9.88-10.59 times, the number of panicles and grain number per ear and 1000-grain weight of Z5 were different by 2.58-3.87 and 2.06-3.00 and 1.03-1.05 times, respectively. With the increase of population density, number of tillers and spikes and percent of tiller-earing were all decreased, the highest population density treatment was less by 2.3-5.2 and 2.8-4.9 and 37.2%-47.7% than the lowest treatment, respectively. When population density was the same, the more tillers and spikes could be formed by increasing holes per hm ² than that by increasing plants in the hole. Yield of Z5 increased by 20.3% in wet year than the drought year, the reasons were spikes and 1000-grain weight all increased significantly. In wet year, the treatment yield of Z5 that combined 7.50TTH/hm ² and 4P/H was the highest and increased by 3.9%-27.1% than others; in drought year, the treatment yield of Z5 that combined 15.00TTH/hm ² and 1P/H was the highest and increased by 0.1%-30.5% than others, and the treatment that combined 7.50TTH/hm ² and 4P/H took the second place.

Key words: Zhangzagu 5, Population density, Precipition years, Hole sowing, Yield