EFFECT OF PHOSPHORUS AND NITROGEN FERTILIZATION AND WEED CONTROL METHOD ON WEED INCIDENCE AND MUNGBEAN PRODUCTION

Abstract

Optimum mungbean yield was obtained when the crop was fertilized with 30 kg P2O5/ha. Beyond this level, a reduction in yield occurred. The addition of nitrogen fertilizer at the rate of 30 and 60 kg/ha decreased mungbean yield.
Weed count and weed weights increased with increasing rate of nitrogen fertilization. On the other hand, phosphorus fertilization showed no effect on these parameters.
Handweeding resulted in higher yield, but required more labor. Preemergence application of butralin or butachlor followed by handweeding 21 days after seeding gave yields higher than that obtained with single application of either herbicide, indicating the need for supplementary weeding for better control of weeds. Off-barring followed by hilling-up provided some degree of weed control but did not adequately control weeds.