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首页> 外文期刊>Plant and Soil >Effectiveness of Sesbania rostrata and Phaseolus calcaratus as green manure for upland rice grown in acidic soil.
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Effectiveness of Sesbania rostrata and Phaseolus calcaratus as green manure for upland rice grown in acidic soil.

机译：Sesbania rostrata和calcaraus calcaratus作为绿肥在酸性土壤中种植旱稻的有效性。

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In a field experiment in 1994 on an acidic soil at Barangay Inao-awan, Philippines, S. rostrata was given 0 or 8 t lime/ha, 0 or 26 kg P/ha and root- and/or stem-inoculated with rhizobia. Plants were cut and incorporated 2 weeks before rice was sown. In a second experiment on the same site in 1995, 15N-labelled S. rostrata or P. calcaratus [Vigna umbellata] was incorporated 0 or 2 weeks before sowing of rice, with or without lime application. A similar quantity of 15N-labelled urea was applied as acomparison. Two weeks after incorporating S. rostrata (95 days after lime application), liming significantly increased N availability, suggesting that the decomposition of S. rostrata by soil microflora was stimulated by lime. Liming, P application andinoculation significantly increased dry matter production, N content and N uptake of S. rostrata, thus enhancing its usefulness as green manure. Regardless of liming, S. rostrata whether applied at 0 or 2 weeks before sowing was superior to urea in improving rice grain and straw yields. P. calcaratus when applied 2 weeks before sowing also produced higher grain yield than urea. Immediate sowing of rice after green manure incorporation did not negatively affect the growth and development of upland rice.N source/sowing date interactions had a highly significant effect on % Ndff (N derived from fertilizer), % Ndfs (N derived from soil), % FNU (fertilizer N use), N uptake and fertilizer N yield (kg N ha-1) of upland rice. However, only N uptake was influenced significantly by liming. The rice plant obtained significantly higher % Ndfs from the soils treated with green manure than those treated with urea regardless of liming. The % FNU and % Ndff from the green manures were 11-37% and 9-25%, respectively.These values are much lower than those obtained under continuously flooded soil conditions, possibly because of the differences in the organic matter decomposer populations and N loss mechanisms between sloping upland conditions and continuously floodedconditions.
机译：1994年，在菲律宾Barangay Inao-awan的酸性土壤上进行的田间试验中，对罗斯特链霉菌的生根/茎干接种了0或8吨石灰/公顷，0或26公斤磷/公顷，并接种了根瘤菌。在播种水稻之前2周，将植物切下并掺入。在1995年同一地点的第二个实验中，在水稻播种前0或2周，掺入或不施用石灰，掺入15N标记的S. rostrata或P. calcaratus [Vigna umbellata]。将相似量的15N标记的尿素作比较。引入土壤链球菌后两周（石灰施用后95天），石灰显着增加了氮的利用率，这表明石灰刺激土壤微生物群落对土壤链球菌的分解作用。石灰，磷肥的施用和接种显着增加了轮状葡萄球菌的干物质生产，氮含量和氮吸收，从而增强了其作为绿肥的效用。无论撒石灰如何，在播种前0或2周施用轮状葡萄球菌在提高稻谷和稻草产量方面均优于尿素。在播种前两周施用方解草也比尿素产生更高的谷物产量。绿肥掺入后立即播种不会对陆地稻的生长和发育产生负面影响。氮源/播期的交互作用对％Ndff（肥料中的氮），％Ndfs（土壤中的氮），旱稻的FNU百分比（氮肥的使用），氮素的吸收和氮素的产量（kg N ha-1）。但是，只有氮的吸收受到石灰的显着影响。不论石灰如何，从绿肥处理过的土壤中，水稻植物获得的Ndfs含量明显高于尿素处理过的土壤。绿肥中的FNU％和Ndff％分别为11-37％和9-25％，这些值远低于在连续淹水的土壤条件下获得的值，这可能是由于有机物分解物种群和氮的差异坡地和连续洪涝条件之间的损失机制

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