Impacts of Biochar Addition on Nitrogen Leaching and Use Efficiency of Leaf-used Lettuce

doi:10.7668/hbnxb.2015.S1.072

Abstract

Abstract: It is very important for non-point pollution control to using appropriate agronomic approaches to reduce nitrogen leaching loss from soil.This experiment was conducted to clarify the impacts of biochar addition on leaf-used lettuce growth,nitrogen utilization and leaching.With pot experiment,leaching amounts of different form nitrogen,agronomic characteristics and nitrogen uptake of leaf-used lettuce were determined under no fertilizer,chemical fertilizer,humic acid fertilizer and application.The results showed that the dissolved organic nitrogen(DON) accounted for 73.8%-77.5% of total N leaching.Among all treatments,the highest amout of N was leached for the conventional treatment,and its ammonium nitrogen(AN),nitrate nitrogen(NN),DON and total nitrogen (TN) leaching were 3.9,48.3,163.2,215.4 mg/pot,respectively.Compared with chemical fertilizer treatment,AN,NN,DON and TN leaching with coconut shell biochar (1%,2%,5%;m/m) were reduced by 40.6%-52.4%,28.8%-54.9%,22.7%-55.5% and 24.4%-55.4%.The biomass of leaf-used lettuce and N use efficiency with biochar application increased 9.46%-26.44% and 9.86%-13.61%,respectively.However,its over-application affected the biomass accumulation of leaf-used lettuce and restrained its root growth.The biomass of leaf-used lettuce was up to the maximum with the 3.2% (m/m) biochar admentment.

Key words: Latosol, Leaf-used lettuce, Coconut shell biochar, N leaching, N use efficiency

CLC Number:

S143.1

ZHAO Feng-liang, ZOU Yu-kun, ZHU Zhi-qiang, LI Hong, LI Qin-fen. Impacts of Biochar Addition on Nitrogen Leaching and Use Efficiency of Leaf-used Lettuce[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(S1): 400-404. doi: 10.7668/hbnxb.2015.S1.072.

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