Abstract:

【Objective】 An experiment was carried out to study the effects of fertilization on wheat yield increase and nutrient efficiency in different agro-ecological regions of China and further to explore approaches of increasing wheat yield and improving fertilizer nutrient efficiency. 【Method】 The indexes, such as partial factor productivity (PFP) and agronomic efficiency (AE), were calculated based on the field experimental data from National Program of Soil-Testing and Fertilizer Recommendation of China, and the historical changes of the wheat yield increase from fertilization and nutrient efficiencies were analyzed in different agro-ecological regions of China.【Result】 The results showed that there were significant differences of applied fertilizer rate in different regions. The highest value was 383 kg•hm-2 in Huanghuaihai Plain and the lowest value was 233 kg•hm-2 in Northern Plateau. Yield increasing results from fertilization in Northwest and Middle and Lower Reaches of the Yangtze River were higher than that in Northern Plateau and Huanghuaihai Plain. The highest value of partial factor productivity (PFP) was 23.9 kg•kg-1 in Northwest and the lowest value of PFP was 17.4 kg•kg-1 in Huanghuaihai Plain. The highest value of agronomic efficiency (AE) was 9.7 kg•kg-1 in Northwest, and the lowest value was 4.2 kg•kg-1 in Huanghuaihai Plain. Compared with 1980s, AEN in Middle and Lower Reaches of the Yangtze River and Northwest increased by 21.0% and 5.68%, respectively, while that in Huanghuaihai Plain and Northern Plateau decreased by 46.0% and 12.4%. respectively. Meantime, AEP in Northern plateau and Northwest increased by 13.7% and 10.4%, respectively, while that in Huanghuaihai Plain and Middle and Lower Reaches of the Yangtze River decreased by 38.6% and 6.24%, respectively. 【Conclusion】 There were clearly increasing in amount of applied fertilizer of wheat in different regions and the difference was remarkable. The wheat yield increases from fertilization were still significant, and the effects were different among various regions. The regions with low level fertilizer rate was not always the area with the high level nutrient efficiency. It is a very effective approach to optimize fertilization and improve the fertilizer use efficiency for yield increase of wheat in the future.

Key words: agricultural resources utilization')">agricultural resources utilization, agro-ecological regions, wheat, yield-increasing effect