Abstract:

The study aimed to explore the application effects of different fertilization modes for reduction and efficiency with fertilizer quota system on single-cropping late rice and its influence on soil fertility in the mid-low hilly areas of western Zhejiang Province. Using the rice variety ‘Yongyou 1540’ as the experimental material, four different fertilization treatments were set up to carry out the experiment for combined applications of slow (controlled) release fertilizers. The results showed that: under the premise that the total nutrient content of chemical fertilizers was reduced by 15.5%, applying slow (controlled) release fertilizers (T₁), and under the premise that the total nutrient content of chemical fertilizers was reduced by 23.7%, applying slow (controlled) release fertilizers combined with organic fertilizers (T₂), compared with conventional fertilization (CF), the yields of single-cropping late rice increased by 12.1% and 15.8%, respectively, the partial factor productivity from fertilizers increased by 32.8% and 51.9%, respectively, the agronomic use efficiency of fertilizers increased by 60.8% and 92.3%, respectively, and the profits increased by 25.6% and 13.1%, respectively. The contents of available phosphorus, available potassium, organic matter and the pH under the fertilization patterns of T₁ and T₂ were all significantly higher than those under conventional fertilization (CF). The soil fertility improvement ability and soil acidification improvement ability of T₂ were stronger than those of T₁. The results of this study could provide technical support for fertilizer reduction and efficiency increase and agricultural green development in the mid-low hilly areas of western Zhejiang Province.

Key words: fertilizer reduction, slow (controlled) release fertilizer, organic fertilizer, single-cropping late rice, economic benefit