EFFECT OF PLANT DENSITY ON PRODUCTIVITY OF SOME SUNFLOWER VARIETIES

Abstract

Mahmoud Gaber Mahmoud El - Baz .Effect of Plant Density on Productivity of Some Sunflower Varieties. Unpublished Doctor of Philosophy Dissertation, Ain Shams University Cairo Egypt. 1995. The present investigation was carried out at Sakha Agriculture Research Station,Agriculture Research Center, Egypt, during 1991 and 1992 seasons.

The aim of these experiments was to study the effect of varieties (Mayak,Florida 2000 and Sigco 475), hill distances (20, 30 and 40 em.) and ridge widths (50, 60 and 70 em.) on growth, yield and yield components and seed chemical composition for sunflower I? ts. vo. The obtained results showed that Mayak surpassed the -{Otper varieties in green leaf area I plant, LAI, number of green !<;:ayes /plant, dry weight of green leaves I plant, stem diameter, •::/•\.J. . iJt mode length, plant height, dry weight I plant, LAR, SLA at most growth periods and in head and stem diameter, number of ds I head, 100 - seed weight, seed yield per both plant and gdan, oil, protein and carbohydrate yield per feddan at harvest. i• Narrow spacing between hills significantly increased the LAI, internode length, plant height and LAR at most growth periods and the oil, protein, carbohydrate and seed yield I fed. at harvest. Narrow ridge widths significantly increased the leaf area I p!ant, LAI, LAR ,SLA at most growth periods and the oil, protein, c. ohydrate and seed yield I fed. The highest oil %obtained by sowing Sigco 475 at 40 em apart hills under 60 em ridge widths and the highest oil yield I fed. recorded by sowing Mayak at 20 em apart hills under 50 em. ridge widths. The highest seed yield I fed. recorded by sowing the same variety at 50 em. ridge width.