For the purpose of comparing the relative effect of various farm manures, field experiments were carried out for four years at Nanking on a paddy soil; containing organic matter 1.5%, dcrived from yellowish brown earth.
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朱光琪.农家肥料肥效的研究(一) 农家肥料对水稻的肥效[J].土壤学报,1959,7(Z2):180-189. K. G. CHU. INVESTIGATION ON THE NUTRITIVlE VALUE OF FARM MANURES I. THE EFFECT OF FARM MANURES ON RICE[J]. Acta Pedologica Sinica,1959,7(Z2):180-189.