Determinación del periodo crítico del cultivo de brócoli (Brassica oleracea L.) Var. Avenger en conpetencia interespecífica

Abstract

This current research aims: to determine the critical period of broccoli growing (Brassica oleraceae L) var Avenger in interpecific competition, this research was carried out in the Horticulture Department at Escuela Superior Politécnica de Chimborazo from Riobamba canton; using a Randomized Complete Block Desing (RCBD) in split plot arrangement, two methods of weed control were applied: mechanical method hand weeding (A1) and chemical method using herbicide (A2) with 9 times cultivation and weding (B1,B2……..B9), with 3 repetition, as a result 54 experimetal plots. 9 treatment result from the different times of weed control, was performed at 25, 45, 65 and 85 days. It is handled two periods: initially cultivation during 25,45,65 and 85 days and the rest of the clean cycle; initially clean cultivation during 25, 45, 65 and 85 days and the rest of the clean cycle and a treatment which remained clean during the cycle. There were significant differences for controlling weed control periods like: plant height, leaf number, vigor, polar and equatorial diameter of the Pella, the Pella weight, performance, and cool and dry weed biomass. The best control time was the treatment (A2B9). The expensive treatment was (A1B9) with $2,033.45 and the (A2B9) treatment had the highest net profit with $ 4,072.69. The best performance had treatment (A1B9) with 22,81 tons/ha. The highest marginal rate of return was made in the step of treatment (A2B8) at treatment (A2B1) with 3210.67 %. The critical period of competition was determined at 52 days after transplantation therefore it is recommended to keep clean cultivation to these days. KEYWORDS: BROCCOLI, HORTICULTURE INTERESPECIFIC WEED COMPETITION.