Green Manuring Effect on Yield of Cassava-Sweet Corn Sequential Cropping on Degraded Sandy Soil, Northeast Thailand Roongnapa Bowichean, Suphicha Thanachit*,
Green Manuring Effect on Yield of Cassava-Sweet Corn Sequential Cropping on Degraded Sandy Soil, Northeast Thailand Roongnapa Bowichean, Suphicha Thanachit*,
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绿肥对退化沙土上木薯-甜玉米连作产量的影响，泰国东北部 Roongnapa Bowichean，Suphicha Thanachit*，
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
I. Kheoruenromne
中科院分区：
文献类型：
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作者：
S. Anusontpornperm;I. Kheoruenromne
在泰国典型的桑迪土壤上研究了绿色肥料对木薯-甜玉米复种的影响。鲜生物量最高的是乳子草（18.53t.ha-1），其次是本地杂草（14.08t.ha-1）、刀豆（12.69t.ha-1）和太阳麻（12.39t.ha-1）。剑豆的含氮量最高，为2.28%;孺子草的含钾量最高，为2.32%。对照（本地杂草）的含磷量最高（0.15%），但释放的氮量最高，为148.65mg·mg.kg-1，其次是刀豆、太阳麻和乳子草（分别为133.83，92.77和59.5mg·kg-1）。施用这些绿色肥料后2周氮素释放量最大，并不断减少，而当地杂草的氮素释放量最早结束。结果表明，在该土壤上木薯-甜玉米复种最适宜的绿色肥料是太阳麻，其块茎产量最高（27.19t.ha-1），鲜皮甜玉米产量最高（4.19t.ha-1），但木薯块茎淀粉含量最低（30.13%）。其中，刀豆的木薯产量最低（13.56t.ha-1），而乳子草的甜玉米产量最低（2t.ha-1）。3种绿色绿肥植物对土壤养分残留量低、土壤结构脆弱的土壤性质几乎没有影响，但孺子草对土壤物理性质的改善作用大于太阳麻和刀豆。
The green manuring effect on cassava-sweet corn sequential cropping was evaluated in a sandy Typic Plinthustult soil in Thailand. The highest fresh biomass was observed for ruzi grass (18.53 t.ha -1 ) followed by local weeds (14.08 t.ha -1 ), sword bean (12.69 t.ha -1 ) and sun hemp (12.39 t.ha -1 ). Sword bean tended to contain the highest nitrogen content (2.28%) while ruzi grass had the greatest potassium content (2.32%). The control (local weeds) had the highest phosphorus content (0.15%) but released more nitrogen than did the others with 148.65 mg.kg -1 followed by sword bean, sun hemp and ruzi grass (133.83, 92.77 and 59.5 mg.kg -1 , respectively). The release of nitrogen was greatest at 2 wk after the incorporation of these green manures and the amount continuously reduced, while the release from local weeds ended before the others. Sun hemp was found the most suitable green manure in cassava-sweet corn sequential cropping on this soil and gave the highest tuber yield (27.19 t.ha -1 ) and fresh-peeled sweet corn (4.19 t.ha -1 ) but it gave the lowest starch content (30.13%) of cassava tuber. The incorporation of sword bean gave the lowest cassava yield (13.56 t.ha -1 ) whereas the lowest amount of sweet corn yield (2 t.ha -1 ) was obtained from the incorporation of ruzi grass. The three green manure plants showed almost no effect on soil properties due to the soil still having low residual plant nutrients and weak soil structure but ruzi grass tended to improve the soil physical properties more than did sun hemp and sword bean.