Abstract:
Direct and residual effect of three kinds of vermicompost at various application rates on yield and
quality of broccoli were investigated in field experiment organically. The experiment used a factorial
randomized block design which consisted of two factors. The first factor is the kind of vermicompost
consisted of three levels : v1= the mixture of spent mushrooms waste (SMW), cow dung (CD) and
vegetable wastes (VW), v2=SMW, CD and leaf litter (LL), v3= SMW, CD, VW and LL. The second factor is
the application rates of vermicompost consisted of four levels : 5, 10, 15, and 20 t ha-1 and one control
(inorganic treatment). The results of this study showed that direct effect of vermicompost application
had non-significantly different yield with the control. While residual effect of vermicompost application
significantly (P<0,5) had higher yield of broccoli than the control. Yield of broccoli at the residual effect
decrease by 36-44%. Application of v3 vermicompost 15 t ha-1 had relatively stable yield either at direct
or residual effect. The inorganic treatment had lower quality of broccoli than the treatment using
vermicompost. Application of v2 vermicompost 5-10 t ha-1 relatively had stable quality of broccoli either
at the direct or residual effect. It suggests that application of vermicompost is important to maintain
productivity and quality of organic vegetables.
