Effects of deep placement of nitrogen, phosphorus, and potassium fertilizers on dry matter production, nodulation, chemical composition, and yield of soybeans

Groneman, A.F.

doi:10.31274/rtd-180813-4137

Cited by 2 publications

(1 citation statement)

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“…The effects of deep placement of N-, P-, and K-fertilizers on growth, nodulation, and yield of soybean have been investigated by Groneman [54]. Recently, deep placement of lime nitrogen has been tested in many agricultural fields, and the seed yield and quality are mostly improved.…”

Section: Discussionmentioning

confidence: 99%

Role of Nitrogen on Growth and Seed Yield of Soybean and a New Fertilization Technique to Promote Nitrogen Fixation and Seed Yield

Ohyama¹,

Tewari²,

Ishikawa³

et al. 2017

Soybean - The Basis of Yield, Biomass and Productivity

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Soybean is an important crop for human food and feed for livestock. World soybean production is increasing especially in North and South America. Soybean seeds contain a high percentage of protein about 35-40%, and they require a large amount of nitrogen compared with other crops. Soybean plants make root nodules with rhizobia, and rhizobia can fix atmospheric N 2 and give the fixed N to the host soybean plants. Also, soybean can absorb nitrogen usually nitrate from soil or fertilizers. The amount of total assimilated nitrogen in shoot is proportional to the soybean seed yield either from nitrogen fixation or from nitrogen absorption, and the nitrogen availability is very important for soybean cultivation. Maintenance of a high and long-term nitrogen fixation activity is very important for a high production of soybean. However, application of chemical nitrogen fertilizers usually depresses nodule formation and nitrogen fixation. Nitrate in direct contact with a nodulated part of roots causes severe inhibition of nodule growth and nitrogen fixation, although a distant part of nodules from nitrate application gives no or little effect. Deep placement of slow-release nitrogen fertilizers, coated urea, or lime nitrogen promoted the growth and seed yield and quality of soybean without depressing nitrogen fixation.

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Section: Discussionmentioning

confidence: 99%