![]() A review of biochar and soil nitrogen dynamics. Soil texture analyses using a hydrometer: modification of the Bouyoucos method. Effects of biochar, urea and their co‐application on nitrogen mineralization in soil and growth of Chinese cabbage. Soil physical properties, leaf SPAD and grain yield. Biochar amendment techniques for upland rice production in Northern Laos: 1. Effect of biochar-amended urea on nitrogen economy of soil for improving the growth and yield of wheat ( Triticum Aestivum L.) under field condition. Before making recommendations, further investigations under field conditions are crucial to verify the results of the present study. Due to the desirable effects of biochar and residues application on plant responses and improving nitrogen use efficiency, more attention should be paid to the use of such materials in fertilizer recommendation programs. Results also showed that co-application of biochar and residues with urea significantly improved plant wet and dry matter yield. Results indicated that biochar and crop residue had a positive effect on N use efficiency, especially at 100 mg kg -1 level of urea. ![]() Biochar increased the uptake and concentration of N and P in spinach shoots as compared to the control, but had not effects on the uptake of Fe, Mn, Cu and Zn. In this study, an experiment was designed according to a completely randomized factorial design, in which the treatments consisted of three levels of urea (0, 100 and 200 mg N kg -1) and four levels of biochar/residue (0, 2% biochar, 2% crop residue, and 2% biochar+crop residue) with three replication. ![]() Research on the effects of simultaneous application of biochar, resides, and nitrogen fertilizer on plants growth and chemical composition, especially N use efficiency (NUE), is very limited. Therefore, one of the great concerns lies in finding suitable methods for effective use of N fertilizers. Application of N fertilizer to soil is known as an effective practice for crop yield improvement, but its inappropriate use could result in N loss, which is important from both environmental pollution and economic feasibility standpoints.
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