Studies on the cause of injury by continuous cropping and soil conditioner application on red pepper(Capsicum annuum L.). 1. Studies on the cause of injury by continuous cropping of red pepper
1988
Hwang, N.Y. | Ryu, J. | So, J.D. (Chungbuk Provincial Rural Development Administration, Chongju (Korea R.))
The present experiment was conducted to investigate causes affecting the reduction of red pepper production in the continuous cultivation of upland soil from 1985 to 1986 in Imsil, Chonbuk province. Area ratio of continuous cultivation for 2 years was 12.7%, for 3 years 6.8% and over 4 years 48.9%. Soil hardness and volume of solid and liquid contents of continuous red pepper cultivation soil were higher than those of one year cultivation, while pH and content of organic matter of continuous cultivation soil were low. The exceeding optimum level of phosphorus and potassium appeared as factor affecting the reduction of red pepper in continuous cultivation soil. Microflora density in continuous cultivation soil was high but bacteria/fungi(B/F) and Actinomycetes/fungi(A/F) ratio were low. The density of soil nematodes in continuous cultivation soil were higher than that in one year cultivation soil, however, the steeper and better drainage soil lowered the density of nematodes. Continuous cultivation over 4 years showed 14.3% of plants diseased by phytophthora while 0.7% in one year cultivation soil
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