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首页> 外文期刊>Plant and Soil >Soil nitrogen dynamics and relationships with maize yields in a gliricidia-maize intercrop in Malawi
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Soil nitrogen dynamics and relationships with maize yields in a gliricidia-maize intercrop in Malawi

机译：马拉维草皮-玉米间作的土壤氮动态及其与玉米产量的关系

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摘要

Soil inorganic N dynamics were monitored for two seasons in a gliricidia (Gliricidia sepium)-maize intercrop in the unimodal rainfall area of southern Malawi. One maize crop per year was grown with or without interplanted gliricidia, in factorial combination with three rates of N (0, 24 or 48 kg N/ha). Application of gliricidia prunings increased (P<0.001) topsoil (0 to 20 cm) inorganic N at the end of the dry season and during the early rains. Differences between plus and minus gliricidia treatments were less when total inorganic N to 1-m depth was summed. A greater proportion of the total inorganic N to 1-m depth occurred in the topsoil (0 to 20 cm) when gliricidia was present, suggesting that redistribution of subsoil N to the surface accountedfor part of the N increase by gliricidia. Gliricidia lowered (P<0.05) subsoil water content during drier periods. Gliricidia plots accumulated more (P<0.01) ammonium-N during the dry season. Nitrate-N remained constant during the dry season but rose rapidly in gliricidia plots after the onset of rains. A 2-factor model including pre-season inorganic N and anaerobic N mineralization potential accounted for 84% of the variability in maize yields for the two seasons' data combined. The combination of pre-season inorganic N and potential N mineralization appears to provide a good estimate of N supply to maize in systems receiving both organic and inorganic sources of N.
机译：在马拉维南部单峰降雨区的芦苇（Gliricidia sepium）-玉米间作中监测了两个季节的土壤无机氮动态。每年种植一种玉米作物，不论是否种入轻度麦草，并按三种氮素比例（0、24或48 kg N / ha）进行因子组合。在干旱季节结束时和早雨期间，对芦荟进行修剪可增加（P <0.001）表土（0至20 cm）无机氮。当总无机氮含量达到1 m时，加和减负草剂处理之间的差异较小。当存在草蕊草时，表层土壤（0至20 cm）中，总无机N到1-m深度的比例更大，这表明草蕊草增加了底土N向表面的重新分配，从而增加了N的一部分。干旱期间，千里光降低了（P <0.05）的底土含水量。在干旱季节，节肢动物地块积聚了更多（P <0.01）的铵态氮。在干旱季节，硝酸盐氮保持恒定，但在降雨开始后在草皮虫区迅速增加。对于两个季节的数据，包括季前无机氮和厌氧氮矿化潜力的两因素模型占玉米单产变异性的84％。季前无机氮和潜在氮矿化的结合似乎可以很好地估计同时接受有机和无机氮源的玉米向玉米的氮供应量。

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