Effect of phosphorus and nitrogen fertilizers, irrigation systems and mycorrhizal infection on soybean nodulation [electronic resource].

Includes references.

Two experiments were carried out in the experimental farm at Shalakan in the Kulubia Governorate in Egypt in the summer of both 1996 and 1997 to study the effect of nitrogen and phosphorus fertilizers, irrigation systems, and mycorrhizal effect on nodulation and mycorrhizal spores production on soybean. Soybean (Glycine max(L)Merr) Giza 21 cultivar was planted using three irrigation systems drip, furrow and sprinkler convention with two levels of nitrogen fertilizer ( a Nand 35.7 kg N ha-1) with two forms of phosphorus super phosphate containing 15.5% PzOs and rock phosphate containing 26% PzOs and with two mycorrhizal infection (V AM treatment and without V AM).The number and dry weight of nodules were significantly influenced by drip> furrow> sprinkler irrigation at stage of full bloom (Rz) and beginning of seeds (Rs) stages. The highest amount of nitrogen fertilizers, (35.7 kg N ha-1 significantly increased the number of nodules planrl compared to the control treatment. The interaction effect between irrigation and nitrogen fertilizer at Rz and Rs for the number of nodules planr1 and at Rs for the dry weight were mainly as those of adding nitrogen fertilizer at a rate of 35.7 kg N ha-l under furrow irrigation .

Summary in Arabic.

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