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首页> 外文会议>ACIAR Proceedings no.115; Workshop on Tropical Legumes for Sustainable Farming Systems in Southern Africa and Australia; 20021007-09; Limpopo Province(ZA) >Grain Sorghum Production and Soil Nitrogen Dynamics Following Ley Pastures on a Vertosol in Queensland, Australia
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Grain Sorghum Production and Soil Nitrogen Dynamics Following Ley Pastures on a Vertosol in Queensland, Australia

机译：在澳大利亚昆士兰州的凡拓溶胶上Ley牧场之后，谷物高粱产量和土壤氮动态

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摘要

Highly productive sown pasture systems can result not only in high growth rates of beef cattle, but also lead to increases in soil nitrogen and the production of subsequent crops. The response of grain sorghum to various periods of annual legumes and grasses were investigated in a no-till system in the South Burnett district of Queensland. Two-to-four years of the tropical legumes Macrotyloma daltonii and Vigna trilobata (two self-regenerating annual legumes) and Lablabpurpureus (a resown annual legume) resulted in soil nitrate nitrogen (0-90 cm depth) ranging from 36 to 102 kg/ha compared with 5 to 11 kg/ha after grass only pastures. Grain sorghum produced in up to four crops following the legume pastures exceeded 3000 kg/ha of grain in each season. Simulation studies utilising the farming systems model APSIM (Agricultural Production Systems sIMulator) indicated a high correlation with observed grain and biomass data (r~2 > 0.68) and soil N dynamics. In simulated sorghum crops (1954-2000), grain yield was unlikely to exceed 2000 kg/ha of grain in 60% of seasons following a grass pasture while following 2-year legume leys, grain exceeded 3000 kg/ha in 80% of seasons. It was concluded that mixed farming systems that utilise short-term, legume-based pastures for beef production in rotation with crop production enterprises can be highly productive.
机译：高播种的牧场系统不仅可以导致肉牛的高生长率，而且可以导致土壤氮的增加和后续农作物的生产。在昆士兰州南伯内特地区的免耕系统中调查了高粱对不同时期的豆类和禾草的响应。 2-4年的热带豆科植物Macrotyloma daltonii和Vigna trilobata（两个自生的一年生豆科植物）和Lablabpurpureus（重新种植的一年生豆科植物）导致土壤硝态氮（0-90厘米深度）范围从36到102 kg /相比之下，仅草牧场后为5-11公斤/公顷。豆类草场之后，多达四个作物的谷物高粱每个季节的产量都超过3000公斤/公顷。利用耕作系统模型APSIM（农业生产系统仿真器）进行的模拟研究表明，其与观测到的谷物和生物量数据（r〜2> 0.68）和土壤氮动力学高度相关。在模拟的高粱作物（1954-2000年）中，草牧场后60％的季节谷物产量不太可能超过2000 kg / ha，而2年豆科植物leyley后，80％的季节谷物产量超过3000 kg / ha 。得出的结论是，利用短期的，以豆科植物为主的牧场与农作物生产企业轮流生产牛肉的混合耕作系统，可能具有很高的生产力。

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