Effects of biochar synergized with dazomet fumigation on growth of continuous cropping watermelon
To investigate the effects of different prevention and control strategies on the growth of continuous cropping watermelon and occurrence of soil borne diseases,field experiments were conducted to study the yield of watermelon and incidence rate of fusarium wilt under different fertilizer treatments in dazomet-fumigated soil. The results showed that dazomet fumigation had positive effect on controlling soil borne pathogen quantity. On this basis,applying biochar and organic fertilizer(Fu+BOF)can alleviate the obstacle of continuous watermelon cultivation than simply applying chemi-cal fertilizer(Fu+CF)or organic fertilizer(Fu+OF). At late transplanting stage,the number of soil pathogenic bacteria under the treatment Fu+BOF was the lowest,which was 2273 CFU·g-1,and the activities of plant peroxidase and phenylal-anine ammonialyase were the highest. The incidence rate of watermelon plants can be controlled within 20％. In addition,total yield,commercial fruit mass,commercial fruit rate and average single fruit mass of Fu+BOF treatment were higher than those of other treatment. In the later stage of transplantation,the aboveground and underground biomass of Fu+BOF treatment were the highest,which were 6.13 kg·plant-1 and 6.94 g·plant-1,respectively. Therefore,under the condition of continuous watermelon cultivation,the technical measure of dazomet fumigation+biochar+organic fertilizer can promote the growth of watermelon,as well as reduce the number of pathogenic bacteria,which can change the physiological and biochemical reactions of the plant itself and increase the activity of plant disease resistance related enzymes,this tech-nical measure reduce the incidence rate of watermelon Fusarium wilt,which helps alleviating continuous cropping obsta-cles in watermelon.
万方数据
维普
