| Field plot experiments were employed to investigate fertilizer effects of the technique of whole plastic-film mulching combined with soil overlying and bunch planting of dry-land wheat. The results showed that, compared with no-mulching cultivation (CK), whole plastic-film mulching combined with soil overlying and bunch planting (WFM) increased fertilizer use rate and efficiency remarkably. Under the treatment of WFM, the highest use rate of N, P and K fertilizer was 44.3%, 24.7% and 37.9% respectively, and the average use rate was 38.7%, 21.0% and 29.1% respectively, being 8.6%, 5.1% and 6.6% higher compared with CK. Under the treatment of WFM, the highest use efficiency of N, P and K fertilizer was 14.8, 25.0 kg·kg-1 and 13.1 kg·kg-1 respectively, and the average use efficiency was 12.9, 21.2 kg·kg-1 and 12.3 kg·kg-1 respectively, being 29.0%, 31.7% and 23.0% higher compared with CK. The technique of WFM could improve the absorbing ability of wheat to soil nutrients and increase the relative-yield remarkably in nutritional deficiency zone, thus reducing the fertilization adherence of wheat. Under the treatment of WFM, the highest relative-yield of wheat in N, P and K deficiency zone was 60.0%, 54.7% and 89.7% respectively, and the average relative-yield was 58.0%, 52.7% and 88.8% respectively, being 3.0%, 3.9% and 2.7% higher compared with CK. Under the treatment of WFM, the highest adherence degree of wheat to N, P and K fertilizer was 42.6%, 49.5% and 11.9% respectively, and the average adherence degree was 41.3%, 47.3% and 11.2% respectively, being 3.0%, 3.9% and 2.7% higher compared with CK. |