Effect of plant density on some soybean cultivars under two planting dates [electronic resource].

Includes references.

A field experiment was conducted at Zarzoora Agricultural Research Station, El-Beheira governorate during 1999 and 2000 seasons to study the effect of five plant densities (70000, 105000, 140000, 175000 and 210000 plants/ fed) on three soybean cultivars (G.35, L. G.111 and Crawford) under two sowing dates (May 1st and May 25th)_ The experimental design was spilt-spilt plot with three replications .The main results of this work could be summarized as follows : 1. Early planting on May 1st significantly increased plant height, weight of pods and seeds/plant, weight of 100 seeds, seed, oil and protein yields/ fed, but decreased seed crude protein percentage in both seasons. Differences in pods and seeds/plant as well as oil percentage were significant in one season. However, number of branches/ plant was not significantly affected by sowing date in both seasons. 2. Plant height, weight of seeds/plant, weight of 100 seeds, seed oil content and seed, oil and protein yields/fed in both seasons, number of pods and seeds/ plant and weight of pods/ plant in the first season only were significantly influenced by soybean cultivars, whereas number of branches/ plant and seed protein content were not significantly affected in both seasons.

Summary in Arabic.

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