Tropical Grasslands (1982) Volume 16, 40–43

NOTE ON THE EFFECT OF SOWING DATE, DEFOLIATION MANAGEMENT AND CLOSURE DATE ON THE SEED PRODUCTION AND FORAGE YIELD OF BERSEEM CLOVER (TRIFOLIUM ALEXANDRINUM)

K.F. LOWE and T.M. BOWDLER

Queensland Department of Primary Industries, Ipswich, Qld.

Abstract

The influence of sowing date, defoliation management and date of cessation of defoliation on the seed production and forage yields of berseem clover (Trifolium alexandrinum) was investigated in an irrigated experiment in south-eastern Queensland. Date of closure had the greatest influence on seed yields with closures after early September substantially reducing yields. Seed could only be obtained at the expense of forage yield, with losses of up to 4.3 t ha-1 under conditions that produced the best seed yields of 170 to 180 kg ha-1. An August sowing specifically for seed was a viable alternative if an earlier sowing could not be closed for seeding by September, producing seed yields of up to 100 kg ha-1. Forage yields could be increased by up to 6 t ha-1 if the stand was sown in April rather than June, but seed yields were unaffected.

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