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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) >Growth and Symbiotic Activities of Cowpea Cultivars in Sole and Binary Cultures with Maize
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Growth and Symbiotic Activities of Cowpea Cultivars in Sole and Binary Cultures with Maize

机译：玉米单一和二元培养中pea豆品种的生长和共生活性。

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Nitrogen is a major limiting plant nutrient in cereal production in smallholder farming systems in the Limpopo Province of South Africa and the practice of intercropping the cereal with legumes is usually proposed to enhance nitrogen nutrition in the system. The benefit of symbiotic nitrogen fixation in intercropping systems has, however, been variable over diverse environments and needs further clarification. Alternate intercropping studies of maize and four distinct cowpea cultivars were conducted in 1998/99 and 1999/2000 at Syferkuil and Thabina/Dan in the Limpopo Province to determine the effect of the system on growth, nodulation, N_2 fixation and nitrogen uptake of the component crops. Maize dry-matter accumulation was generally not influenced by intercropping and nitrogen uptake of intercropped maize was only improved relative to the sole culture maize at Syferkuil in 1999/2000. On average, the amount of nitrogen fixed by the cowpea cultivars was higher in the intercropped cowpea than the sole crops, except in 1999/2000 at Syferkuil, where the amount fixed was 8.6% higher in the sole than the intercropped cowpea. The amount of nitrogen fixed by the legumes ranged from 20 to 69 kg N/ha and 87 to 217 kg N/ha at Syferkuil in 1998/99 and 1999/2000, respectively, whereas at Thabina/ Dan, the range was 103 to 175 kg N/ha and 83 to 147 kg N/ha, in 1998/99 and 1999/2000, respectively. Nodule formation differed among the cowpea cultivars tested, with the long-season cowpea cultivars generally producing heavier nodules at both locations in the two growing seasons. The different performance of the cowpea cultivars in nitrogen fixation at the two locations emphasises the importance of the environment on symbiotic nitrogen fixation activities in cowpea.
机译：氮是南非林波波省小农农业系统谷物生产中的主要限制植物营养素，通常建议将豆类与谷物间作以增加系统中的氮营养。间作系统中共生固氮的好处在不同的环境中是可变的，需要进一步阐明。 1998/99和1999/2000年在林波波省的Syferkuil和Thabina / Dan进行了玉米和四个不同cow豆品种的间作研究，以确定该系统对该组分的生长，结瘤，N_2固着和氮吸收的影响庄稼。玉米间质的累积通常不受间作的影响，而间作玉米的氮吸收仅相对于1999/2000年Syferkuil的唯一栽培玉米有所提高。平均而言，间作cow豆的fixed豆品种固氮量要比单独的作物高，但在Syferkuil的1999/2000年，唯一的固定量要比间作的pea豆高8.6％。在Syferkuil，1998/99年和1999/2000年，豆科植物固氮的量分别为20至69 kg N / ha和87至217 kg N / ha，而在Thabina / Dan，范围为103至175分别在1998/99年和1999/2000年，每公斤N / ha和83至147公斤N / ha。在所测试的cow豆品种中，结节的形成有所不同，长季节的cow豆品种通常在两个生长季节的两个位置均产生较重的结节。 locations豆两个品种在固氮上的表现不同，强调了环境对cow豆共生固氮活动的重要性。

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