Effects of biochar application on total nitrogen and alkali-hydrolyzable nitrogen content in the topsoil of the high-yield cropland in north China Plain
This paper based on a 3 year experiment in the high-yield cropland in North China, the effects of biochar and fertilizer application on soil nitrogen status for the winter wheat - summer maize rotation system was studied. The experiment was carried out in randomly arranged districts, with 4 treatments and 3 replications per treatment: CK (only mineral fertilizers), C1 (2250 kg.hm-2 biochar rate plus mineral fertilizers), C2 (4500 kg. hm-2 biochar rate plus mineral fertilizers), and CN (750 kg·hm-2 biochar rate mixed with mineral fertilizers as slow-release fertilizer). Results indicated that the application of biochar had obvious effects on the total nitrogen (TN) content in the soil:in the 0-7.5 cra layer, treatment C resulted the largest N content in soil (1.7 g·kg-l), and the difference between treatment C and CN was statistically significant (P＜0.05); in the 7.5～15 cm soil layer, although the application of biochar increased the TN content, resulted difference was not statistically significant (P＜0.05). In both soil layers, effects of biochar application didn't show significant irapact on soil available nitrogen concentration. According to the preliminary results, biochar application could increase the TN content in the topsoil layer, and can be used as a measure of increasing TN content in the topsoil in the high-yield cropland in north China plain.
国家科技期刊平台
NSTL
万方数据
维普
