Tree growth, fruit yield and soil chemical properties in ageing plum orchards
1986
Watanabe, T. | Takano, T.
In order to investigate the effects of the chemical composition of the soil as the main factor in low fruit yield, and to investigate the growth and fruit yield in ageing plum orchards, we made a comparative study of first yield orchards and continuous yield orchards, and also of orchards of different ages. 1. In continuous yield orchards, the length of new shoots and the increase in trunk circumference was found to be slightly less than in first yield orchards and the fruit yield per tree also averaged over the whole investigation, 10% less. 2. A study of the leaves revealed that in the case of first yield orchars, the chemical composition of the leaves was higher and especially in the case of nitrogen, calcium, magnesium, iron and manganese, the difference was very great. 3. A study of the chemical composition of the soil revealed that in ageing orchards, there was a large accumulation of exchangeable potassium and available phosphorus However as there was a lack of exchangeable calcium, Ca/K was low, and the soluble iron and the water soluble boron content was found to be low.
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