(Agricultural Information Research, Japan, 12(2), 105-122, 2003)

Estimation of Shading of Ground Surface Used Wheat and Barley Leaves by Image Processing

Kazuhiro NAKANO, Hajime ARAKI, Toshinori FUKUYAMA and Tomokazu HAMADA

Summary

To investigate the possibility of weed control by living mulch of wheat and barley, shading ratio and ground cover ratio on the ground surface by leaves were estimated when two wheat cultivars and 18 barley cultivars were sown on one day and grown in greenhouse. Wheat cv. Mulchmugi, commercial cultivar for green manure, showed higher performance at the tiller number, top plant length from the ground and shading ratio when it was sown in July at a seeding density of 3.2kg/10a or more. Wide variation was shown at tiller number and top plant length of barley sown in May at a seeding density of 3.2kg/10a. Some barley cultivars showed a larger shading ratio than cv. Mulchmugi, especially it reached 74% 28days after sowing in K027. Ground cover ratio was calculated by image processing using video data of top of wheat and barley. It showed 40% in cv. Mulchmugi, whereas those of barley had a wide range of variation. There was a relationship between ground cover ratio and some characteristics of top growth such as tiller number, top plant length and top dry weight. Although the relationship between shading ratio and tiller number, top plant length and ground cover ratio was recognized, there was no relationship between shading ratio and top dry weight. Barley cultivars such as K001, K027 and K069 were thought to be processing materials for living mulch.



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