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EFFECTS OF PLANT DENSITY AND ROW SPACING ON THE GROWTH AND YIELD OF SUNFLOWER (Helianthus annuus L.)
ABSTRACT
A field study was conducted during the 1990 cropping season at Samaru to investigate the effects of plant density and row spacing an the growth and yield of sunflower (Helianthus annuus L.) Var. Isaanka. The treatments which consisted of plant densities (17,800; 35,600; 53,300; 71,100 and 88,900 plants) and three row spacings (25, 50 and 75cm), were laid out in a randomized complete block design with Four replications. The highest seed and oil yields per hectare were obtained at 53,300 plants/ha. The number of seeds per head, 1000 – seed weight, seed yield per plant, plant height, leaf area per plant, number of leaves per plant, plant dry weight, head dry weight, stem and head diameters were significantly decreased while plant height was significantly increased by increasing plant density. Lodging was more severe at low and high densities compared with medium density. Seed yield was significantly higher at 50cm than 25cm row spacing while the difference between 50 and 75cm was not. significant. Plant dry weight and head diameter significantly increased with increasing raw spacing up to 75cm while stem diameter, head dry weight number of seeds per head and seed yield per plant increased with increasing row spacing up to 50cm only. The interaction between plant density and raw spacing was significant on plant dry weight (12 WAS) and head diameter Both parameters were highest at 17,800 plants/ha and 75cm row spacing. Correlation analysis indicated that seed yield was significantly negatively correlated with most of the yield components, but the reletionship between seed yield, plant height and lead area index was significantly positive . The results obtained in this study indicated that the highest seed and oil yields of sunflower were obtained at 53,300 plants/ha and at a spacing of 75cm between rows.
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