Soil and leaf nutrient analyses in relation to yield and quality of durian
2001
Abad, N.T. | Pilapil, N. (Department of Agriculture, Bago Oshiro-Davao City (Philippines). Southern Mindanao Integrated Agricultural Research Center)
Nutritional requirements of durian from flowering to fruit maturity are considered critical as they are related with yield and fruit quality. A study was conducted at SMIARC, Bago Oshiro, Davao City [Philippines] to determine the relationship of soil and leaf nutrients to yield and fruit quality of durian. Forty Chanes variety durian trees were used to test the different levels of N, P, K, Ca, and Mg based on the recommended rate (RR) of 1.2 kg N, 0.7 kg P, 1.2 kg K, 1.7 kg Ca, and 0.7 kg Mg. Results revealed that increasing the RR by 25% would increase yield by 65% and its fruits were observed to have high TSS of 27 degree brix compared to unfertilized trees and other subsequent fertilizer levels, thus producing a net benefit of P1,037,528. Highest yield of 20,900 kg/ha was attained at 2.8% leaf N before it started to decline, while TSS of 27 degree brix was observed at 2.4% leaf K. Fruit weight decreased as the number of fruits per tree increased. On the other hand, fruit shape and percent edible portion showed no significant difference regardless of the levels of application. Uneven fruit ripening (UFR) had an inverse relation with leaf Ca. Moreover, fruits weighing more than 3 kg with pulp units of more than 10 were more likely unevenly riped. The same trend was also observed on the wet core with leaf K. However, a higher level of confidence of 90% was observed when wet core was correlated with rainfall. A maximum of 80% wet core incidence was recorded when rainfall reached to 345 mm/wk while least incidence was recorded when rainfall was below 100 mm/wk. Correlation analysis of soil and leaf values revealed that leaf analysis could give a better predictive value of the nutrient needs of durian and is more reliable in determining the nutritional requirement of durian during its productive stage
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