Abstract:

To solve the problem of increasing the production capacity of middle and low yield rice fields in the middle and lower reaches of the Yangtze River, 6 treatments were set up for a field test in Dangyang, Hubei, including: local conventional fertilizer (T₁), conventional compound fertilizer+3000 kg/hm² bio-organic fertilizer (T₂), organic-inorganic compound fertilizer (T₃), biochar based fertilizer (T₄), rice-specific formula fertilizer (T₅) and non-fertilizer (CK). The effects of different fertilization modes on rice yield and nutrient utilization efficiency were studied under the same fertilization amount. The results showed that under different fertilization treatments, rice yield and yield components were T₄>T₅>T₃>T₂>T₁>CK. Compared with T₁ treatment, T₂-T₅ treatments increased yield by 4.27%-19.27%, respectively; under the same nitrogen application, the nitrogen accumulation of T₂-T₅ treatments increased by 4.08%-32.03% compared with T₁ treatment, and T₂-T₅ treatments increased the nitrogen uptake, nitrogen contribution rate, nitrogen partial factor productivity, nitrogen agronomic efficiency and nitrogen apparent efficiency in the production of 100 kg seeds by 1.96%-9.15%, 11.26%-44.86%, 4.26%-19.27%, 16.23%-72.79% and 7.80%-61.22%, respectively; under the same phosphorus application treatment, the phosphorus accumulation of T₂-T₅ treatments increased by 4.60%-26.67% compared with T₁ treatment, and T₂-T₅ treatments increased phosphorus uptake, phosphorus partial productivity and phosphorus apparent utilization rate in the production of 100 kg seeds by 4.28%-19.27%, 3.33%-10.00% and 12.48%-71.90%, respectively. Under the condition that the total amount of nitrogen, phosphorus and potassium fertilizer was the same, selecting appropriate slow-release fertilizer for basic application and rationally application of tillering fertilizer could not only improve the fertilizer absorption and utilization rate, but also increase the rice yield.

Key words: different fertilizer sources, rice yield, fertilizer use efficiency, nutrient absorption, biochar based fertilizer, nitrogen fertilizer partial productivity