SEED YIELD OF ALTAI WILD RYEGRASS AS INFLUENCED BY ROW SPACING AND FERTILIZER

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Abstract
A study was conducted from 1969 to 1977 to determine the effect of row spacings and applications of N and P fertilizer on the productivity of Altai wild ryegrass (Elymus angustus Trin.). The optimum row spacing for highest seed production was 120 cm and the optimum fertilizer treatment was 25 kg N/ha plus 25 kg P/ha annually. Doubling the rate of N or N plus P did not significantly increase the seed yield over that obtained from grass receiving the 25 kg N plus 25 kg P per hectare rate. Fertilizer treatments containing P tended to result in a more stable year-to-year response than those containing only N. Altai wild ryegrass grown in 30-cm row spacings produced higher dry matter yields for the first 4 yr than that grown in wider-spaced rows. However, in the last 4 yr highest yields were obtained from grass seeded in rows spaced 150 cm apart. Grass receiving an annual application of 50 kg N/ha plus 50 kg P/ha produced significantly more forage than that given, only 25 kg N/ha, both of which outyielded unfertilized grass.

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