10 雑草による苗畑地力の判定(第II報)

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we continued the investigation on the relation between the soil fertility and growth of weeds, and obtained following results. 1) Digitaria ciliaris (one of the most common weed of farm yard) is a good indicator of fertilized soil. The growth of this weed increased when P_2O_5,K or Ca supplied abundantly, but decreased when N supplied abundantly. It was recognized an injuly of SO_4 because the nitrogen supplied as NH_4SO_4. 2) Portulaca oleacea is also a good indicator of fertilized soil. The growth of this weed increased when N or P_2O_5 supplied abundantly, but decreased when K or Ca supplied abundantly. 3) The growth of another weeds are also affected possitive or negative influence by some fertilizer. Therefore, if we notice the growing situation of weeds on the nursery beds, we shall be able to know rougnly their soil fertility.
一般社団法人日本森林学会の論文
1951-01-25