With the objective of studying the effects of weed competition period over some productive paramete rs of peanut crop cv. Tatu -53, it was carried out the present research in Jaboticabal in a "Red Dark Latosol soil-sandy phase". The experimental de sign used was the Randomized block being treatments devided in two groups: in the first, the crop was maintained in weed competition since the germination up to a specific point of its development cycle and in the second one it was maintained free of weed competi tion in equivalent periods to the first group, after the weeds were permitted to grow freely. The periods extensions studied were 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 days. The peanut crop have show rela tively tolerant to the weed competition, and a period of ten days of weed free in the begining of it development cycle proportionated full productivity when compared with the treatment maintened free of competition. In relation to the initial period in competition the results, indicate the period after the flowering in general is critics, generally after the 50 days of the crop development cycle.
Arachis hypogaea; weed competition