Effect of different water and fertilizer supply on dry matter accumulation,nutrient uptake and yield of cabbage

The field experiment was carried out to study effects of different water(75%,65%,55%lower irrigation limits)and fertilizer(traditional fertilizer,reducing 10% fertilizer,reducing 20% fertilizer)on dry matter accumulation and sample absorption of cabbage(Brassica oleracea L.var.capitata L.)cultivated mainly in Northwest area of China.The results showed that the treatment of 65%lower irrigation limits irrigation(1960 m3/hm2)combined with saving 20% fertilizer(N 304kg/hm2,P2O5 204kg/hm2,K2O72kg/hm2)were in favor of accumulating dry matter of cabbage,and in each period the root cap ratio was small;the absorption of N,P and K was the highest in cabbage head,reached 153.26,33.9,130.94kg/hm2.harvest index significant higher than local irrigation and fertilization;the yield(91 172kg/hm2)had no significant difference compared with the local tradition irrigation and fertilizer,but there appeared the advantages of fertilizer-saving and environmental protection.