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种植密度是影响马铃薯块茎生长发育的主要因素之一。主栽品种 Mira 和783-1各3种密度的试验结果表明,随着单位面积播种密度的增加,单位面积上的主茎数及块茎数目均增加,而块茎的平均重量及大中薯率则减少。单位面积上的光能截获量与植株干重、块茎干重和块茎的平均重量均呈极显著的直线相关。Mira 和783-1的光能转化系数分别为1.444克干重/兆焦和1.106克干重/兆焦。分配到块茎的干物质比率随着块茎的生长而增加,最终两品种的干物质转化率均为85%左右。而密度对各品种的光能转化率及块茎干重分配率均无显著影响。因此,种植密度主要是通过对单位面积上块茎数量的控制来影响块茎所获得的屯合产物的数量及块茎的生长发育。
Planting density is one of the main factors affecting the growth and development of potato tubers. The results of three kinds of densities of main cultivars Mira and 783-1 showed that with the increase of sowing density per unit area, the number of main stalks and tubers per unit area increased, while the average weight of tubers and the medium and large potatoes cut back. The amount of intercepted light energy per unit area showed extremely significant linear correlation with plant dry weight, tuber dry weight and tuber average weight. The solar energy conversion factors for Mira and 783-1 were 1.444 grams dry weight / MJ and 1.106 grams dry weight / MJ, respectively. The dry matter ratio assigned to the tubers increased with tuber growth, with the final dry matter conversions for both varieties being around 85%. However, the density had no significant effect on the light energy conversion rate and dry weight distribution rate of all varieties. Therefore, the planting density mainly affects the number of tubers obtained from tubers and the growth and development of tubers by controlling the number of tubers per unit area.