This paper has studied the growth of ryegrass in mixed soil of copper mine tailing and garden soil as affected by some amendments including montmorillonite, rice straw and chicken manure.

研究了黑麦草在铜矿尾矿砂与菜园土复合土壤上近一年多的生长状况及其影响因素。

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It recommends they use rice and wheat straw for mulch instead of burning it, rotate their crops, use a range of different seeds, manure their fields, and so on.

ECONOMIST: Punjabis are poisoning themselves