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柽麻是一种速生短期绿肥,夏播生长四十多天即可翻压利用。我省种植面积逐步扩大,受到群众欢迎。但从大田示范来看,其增产效果不很稳定,甚至出现有不增产或减产的现象。绿肥肥效的高低受许多因素的影响,而柽麻本身的肥效是应首先探讨的。为此,我们于1973-74年作了不同生长期对土壤肥力影响的试验。一、试验设计:豆科绿肥利用根瘤固氮,作为植株氮素的主要来源;同时也在土壤中吸取部分氮素。柽麻绿肥生长期短,而单位面积产量较高,是否从土壤中吸收氮素较多;据过去观察,柽麻收种后的茬地肥效往往比压青的效果还好,似与柽麻根瘤固氮盛期偏晚有关。因此,设计柽麻不同生长期翻压,进而观察各处理从土壤中吸取和遗留氮素情况,以探索固氮盛期。试验处理为:
Ma flax is a fast-growing short-term green manure, summer planting more than 40 days to turn pressure use. The planting area in our province has been gradually expanded and welcomed by the masses. However, from the demonstration of Daejeon, the yield increase effect is not very stable, and even the phenomenon of not increasing or decreasing output occurs. The level of green manure effect by many factors, and flaxseed itself is the first to explore the effect of fertilizer. To this end, we conducted experiments on the effects of different growth stages on soil fertility in 1973-74. First, the experimental design: Legume green manure using nodulation of nitrogen, as the main source of plant nitrogen; also draw some nitrogen in the soil. Ma flax seedling growth period is short, and the high yield per unit area, whether from the soil to absorb nitrogen more; according to the past observation, after sowing seeding crop stubble fertilizer effect is often better than the pressure of green, it seems with flaxen Nodular nitrogen fixation is late. Therefore, we designed the cupping plants in different growth stages and then observed the nitrogen uptake and leftovers from the soil to explore the nitrogen fixation period. Test treatment is: