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一、合理密植(一)种植密度对菠萝产量的影响:卡种菠萝在亩植5,000株,菲种、台种在6,000株的范围内,其单位面积产量(亩产)随着株数的增加而递增的。单果重量随着株数的增加而递减。(二)种植密度对菠萝生长发育的影响:叶片生长量:密度较大的生长较缓慢,叶片数一般随每亩株数的增加而减少,菠萝的D—叶(一株中最完熟,即最长的叶片)长度一般是与种植密度呈正相关的。就是种得愈密,D—叶愈长。但D—叶的宽度与厚度一般与种植密度呈负相关。根系生长量:菠萝的根数与叶片数一般是呈正相关的,在不同种植密度下,菠萝的根数是随株数的增加而相对减少的。但是,由于菠萝株数的增加,菠萝总的叶面积系数扩大了,在茂密的绿色叶幕遮蔽之下,菠萝的地下根群反而较为健旺,活根数多了,死根数少了(见表1)。
First, the rational close planting (a) planting density on the yield of pineapple: pineapple card planted 5,000 acres of planted, Philippine species, Taiwan species in the range of 6,000, the yield per unit area (mu) with the number of plants increased Increasing. The fruit weight decreased with the increase of the number of plants. (B) the planting density of pineapple growth and development: leaf growth: the density of the relatively slow growth, the number of leaves generally with the number of trees per acre decreased, D-pineapple (one of the most mature, the most Long leaves) are generally positively related to plant density. Is the kind of more dense, D-leaf longer. However, the width and thickness of D-leaf are generally negatively correlated with plant density. Root growth: the number of pineapple leaves and the number of leaves is generally positively correlated, at different planting densities, the number of pineapple with the number of plants increased relative decline. However, due to the increase of the number of pineapple, the total leaf area coefficient of pineapple increased. Under the cover of dense green leaf curtain, the underground root group of pineapple was rather thriving, the number of alive roots was more and the number of dead roots was less (see table 1).