主要畑雑草の生育時期と生育量について

概要

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1. In order to study growing stage, growing rate and seed production of main upland weeds, seeds (10 species) were sown in Wagner pots (1/2,000 are) at six dates in 1972 and five dates in 1973. 2. On the cases that were sown at May. June and July, days from emergence to beginning of seed fall were as follows; [figure]3. Large crabgrass was the largest on dry weight at harvesting time, and the descending orders were barnyardgrass. Asiatic dayflower, common lambsquarters, chufa and P. lapathifolium. Common purslane, livid amaranth, Virginia copperleaf and F. villosa were very little. 4, Seed production rates (seeds/plant) of May sowing were as follows; chufa =⃥ common purslane > common lambsquarters =⃥ large crabgrass =⃥ livid amaranth > barnyardgrass 50,000~100,000 10,000~20,000 2,000 =⃥P. lapathifolium > Fatoua villosa > Asiatic dayflower > Virginia copperleaf. 5,000 1,500~3,000 800~1,000 150~300
日本雑草学会の論文
1977-07-25