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保护地栽培的单位面积产量是露地栽培所不可此拟的,即使从经济上看,单位面积的总收入也是露地栽培的好几倍。但是,总收入增多,支出费用也多。为了提高单位面积收益,就必须进一步提高单位面积产量。而靠“粪大水勤,不用问人”的管理方法,只能维持低水平产量。要获得高产,还必须提高地力,采用提高土壤肥力的技术。 1.有关施肥方面在保护地栽培中,肥料成分几乎沒有淋失,在施用的肥料成分里,除作物吸收部分外,几乎都残留在土壤中。同时,保护地栽培的施肥量一般比露地栽培多,仅以N成分为例,常常可达到吸收量的2—3倍。因而,前茬结束后,予料中的大量残留量就作为下茬的基肥
Protected cultivation per unit area yield is open planted cultivation can not be this even though economically, the total income per unit area is also open cultivation several times. However, the total revenue has increased, the cost of spending more. In order to increase the yield per unit area, we must further increase the yield per unit area. By “excrement water, do not ask people” management approach, can only maintain a low level of output. To achieve high yields, you must also increase your soil fertility by using techniques that increase soil fertility. 1. In the area of fertilizing cultivation, there is almost no leaching of fertilizers in the protective cultivation. Almost all of the fertilizers, except the crop-absorbing parts, remain in the soil. In the meantime, the amount of fertilizer applied in protected areas is generally higher than that in open field. Only the N component is used as an example, and the amount of fertilization can often reach 2-3 times. Therefore, after the end of the previous crop, a large amount of residue to the expected as the base crop of the next crop