Effects of amount of fertilizer used and its time of application for female flower formation in 'Taishuu' persimmon
2018
Suzuki, T. | Niikawa, T. | Wada, T.
'Taishuu' persimmon bears both male and female flowers. With age, the ratio of female flowers decreases, whereas that of male flowers increases, thereby leading to decreased fruit yields. The fruit set number, which is the number of leaves per fruit, is 30 in 'Taishuu', and is considered a lower fruit load than that of 'Fuyu' with a fruit set number of 20. This experiment attempted to secure profit from a higher unit price while restricting the number of fruit sets compared with that of 'Fuyu'. However, there were concentric cracking problems, which led to poor quality shipment of the produce, thereby causing lesser profit than that of 'Fuyu'. Therefore, a method of fertilizer application that can stabilize the number of female flowers while securing the same yield as that of 'Fuyu' was examined. Considering the supplemental application of fertilizers applied in May and June, the number of leaves per fruit was set to 20. The number of flower buds for female flowers and the ratio of shoots with female flowers increased. The amount of pre-plant nitrogen application was 10 kg per 10 a of 'Taishuu'. Five kilograms of supplemental fertilizer was separately applied in May, June, and July. The total of 25 kg fertilizer per year is assumed to increase the formation of female flowers in 'Taishuu'.
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