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1971年,由于白肋烟定额制发生了变化,即由土地面积定额制改成了销售量定额制,所以,在白肋烟常规生产和销售准备的过程中,烟农的兴趣转向了增加单株产量,以减少单株或小群植株管理的用工和费用。降低田间栽植密度是增加单株重量的有效方法。在北卡罗来纳州西部进行了7个田间试验,研究了9种株行距组合对单位面积产量和单株产量的影响。当栽植密度从每公顷26350株降低到13042株时,单位面积产量呈直线下降,而单株产量则呈直线上升。就栽植密度相等的两种株行距组合来说,无论是单位面积产量,还是单株产量,都以宽株距的组合提高显著。根据直线回归分析,生产相同重量的晾制烟叶,所需植株数量从上限到下限可减少35%,但土地面积则需增加31%。假设生产白肋烟所投入的主要人工和费用基本上取决于所用土地的面积、管理的烟株数量和烟叶重量的话,那末用于烟株管理上的人工就占总用工量的70-80%。株行距从最窄加大到最宽时,总工时减少了27%。在这种情况下,主要由于减少了人工开支,生产费用(不算增加的土地)减少了11%,而纯利润却增加了19%。然而,当增加的土地必须租用或者要代替其他用途时,则土地代价就必须计入生产费用,因此就会减少纯利润。晾制后烟叶的平均市价未受到株行距的影响,而生物碱和氮素的含量一般来说与栽植密度成反比。
In 1971, because of the change in the quota system for burley tobacco, which was changed from a quota system of land area to a quota of sales volume, the interest of tobacco farmers turned to increase the number of individual plants during routine production and sales preparation for burley Production to reduce the labor and costs of plant management or plant management. Decreasing field planting density is an effective way to increase plant weight. Seven field trials were conducted in western North Carolina to study the effects of 9 row spacing combinations on yield per plant and yield per plant. When the planting density was reduced from 26,350 plants per hectare to 13042 plants per hectare, the yield per unit area dropped linearly while the per plant yield increased linearly. In terms of the combination of spacing between two plantations of the same density, both the yield per unit area and the yield per plant increased significantly with a combination of wide plant spacing. According to the linear regression analysis, the production of the same weight of air-cured tobacco leaves can reduce the number of plants required from the upper limit to the lower limit by 35%, but the land area needs to increase by 31%. Assuming that the major labor and costs involved in the production of burley tobacco are largely dependent on the area of land used, the number of tobacco plants managed and the weight of the tobacco, the manpower used for tobacco plant management accounts for 70-80% . When the row spacing increased from the narrowest to the widest, the total man-hours reduced by 27%. Under these circumstances, production costs (not increasing land) were reduced by 11% mainly due to a reduction in labor costs, while net profit increased by 19%. However, when the additional land has to be rented out or replaced for other purposes, then the land cost must be included in the production costs, thus reducing the net profit. After drying, the average market price of tobacco leaves was not affected by the row spacing, while the content of alkaloids and nitrogen was generally inversely proportional to the planting density.