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众所周知,栽培水稻较旱作有可能积累更多的有机碳,就太湖周围发育起来的脱沼水稻土而论,这种趋势尤为明显。据测定,由稻—麦两熟改为麦—稻—稻三熟的10年前后对比,该类土壤就增加0.5％的有机质,随之带来的问题是土性迟发,有机质的矿化差,化肥效果也受限制。为此,为了在这类土壤上也能获得高产稳产,有必要运用不同的施肥处理进行连续性的田间试验,以探究不同碳、氮水平对产量的影响,从而求得合理的培肥途径。 田间试验于1978—1980年间在青浦县农科所农场典型的青紫泥土壤上进行。各试验处理区均为连续试验区,各茬作物均进行吸肥力测定和地力变化测定,现将三年试验结果汇总于后:
It is well-known that cultivated rice may accumulate more organic carbon than dry farming. This trend is especially evident in the case of de-marsh paddy soil developed around the Taihu Lake. According to the determination, compared with 10 years before and after changing from rice-wheat double crop to wheat-rice-rice ripening, this kind of soil increased 0.5% organic matter, and the subsequent problems were the delayed soil type, mineralization of organic matter Poor, fertilizer effect is also limited. Therefore, in order to obtain high and stable yield in this kind of soil, it is necessary to use different fertilization treatments to conduct continuous field experiments to explore the effects of different carbon and nitrogen levels on yield, so as to obtain a reasonable way of fertilizing. Field trials were conducted on a typical purple soil soil farm in Qingpu County Agricultural Institute from 1978 to 1980. Each test treatment area are continuous test area, each crop is carried out to determine the absorption of fertility and determination of changes in the ground, now the three-year test results are summarized in the post: