초록

용어보기논문에서 용어와 풀이말을 자동 추출한 결과로, 시범 서비스 중입니다. AI-Helper

Abstract ▼ AI-Helper

This study was conducted to investigate the effects of the long-term applications of N, P and K fertilizers on fruit quality and yield of 17-year-old satsuma mandarin (Citrus unshiu Marc. cv. Okitsuwase) from 1994 to 2004. The experiment plots were arranged by the randomized block design with 3 repl...

This study was conducted to investigate the effects of the long-term applications of N, P and K fertilizers on fruit quality and yield of 17-year-old satsuma mandarin (Citrus unshiu Marc. cv. Okitsuwase) from 1994 to 2004. The experiment plots were arranged by the randomized block design with 3 replications. Treatments of N, P and K fertilizers on satsuma mandarin were no-fertilizer (NF, 0-0-0 ㎏·㏊-1), no-nitrogen (NN, 0-400-280 ㎏·㏊-1), no-phosphorus (NP, 280-0-280 ㎏·㏊-1), no-potassium (NK, 280-400-0 ㎏·㏊-1), control (C, 280-400-280 ㎏·㏊-1) and three times of control (3C, 840-1200-840 ㎏·㏊-1). Fruit yield and characteristics were investigated every year. Fruit yields in NK, NN and NP treatments were lower than that of control, but those in NK and 3C were not different with control. Sugar contents measured during 6 years ranged from 9.6 to 9.8 °Bx in C, NN, NP and 3C treatments, but that in NK tended to be higher as 10.4 °Bx. Average acid contents ranged from 1.30 to 1.35% in C, NN, NP and 3C treatments, but 1.16% in NK. Decreasing application of potassium fertilizer decreased large size ratio of fruit and inversely increased medium size, while nitrogen and phosphorous fertilizer did not. In 3C, the color index (‘a’ value) of peel was the lowest, meaning that maturation of fruit is retarded; also thickness of peel and endocarp was the thickest. In conclusion, potassium fertilizer seems to be significantly related to yield and quality for citrus fruit. Hence, further studies are required to seek the optimal range of potassium levels in soil and plant tissues to increase productivity and to elevate the ratio of marketable fruit.

주제어