| The cotton species, XinLuzao 33, was tested through field plot experiments at the Water-saving Irrigation Station of Xinjiang Academy of Agricultural and Reclamation Science in 2012. The effects of fertilization levels were evaluated on the uptakes of nitrogen, phosphorus and potassium by cotton, dry matter accumulation and yield under mulched drip fertigation. There were five fertilization levels of N-P2O5-K2O (150-60-30, 200-80-40, 250-100-50, 300-120-60, 350-140-70 kg·hm-2, as F1, F2, F3, F4 and F5, respectively) and the irrigation level was set as 100% ETc(the crop evapotranspiration). Results showed that the dry matter accumulation, the uptakes of N, P2O5, K2O and their uptake rates were elevated with the increase of fertilizer amounts, which reached maximum values at the F4 level. Cotton yield had a tendency to become increased with escalation of fertilizer amount, but there were no significant differences between F3, F4 and F5. The AEN, AEP, AEK and PEP at the F3 level were significantly larger than those at the F4 and F5 levels. In terms of fertilizer saving and ecological sustainable development, the F3 level with N-P2O5-K2O of 250-100-50 kg·hm-2 was suggested be the optimal fertilization application. This study could provide valuable information for improving the management of cotton under mulched drip fertigation in Xinjiang. |