Articles
ANNUAL CHANGES OF LEAF NUTRIENT CONCENTRATIONS IN ‘FUYU’ PERSIMMON GROWN IN THAILAND
Article number
940_12
Pages
105 – 112
Language
English
Abstract
Thai farmers apply imported fertiliser applications to persimmon that have been suggested from countries with temperate climates.
Structural differences of trees and local climate attributes are not addressed, particularly the tropical climate in Thailand and the longer growth period.
This study focused on identifying nutrient status in response to the tropical growth of Fuyu persimmon in Thailand.
Two studies were done: i) identify an optimum nutrient range, and ii) suggest a leaf sampling schedule.
Findings will be applied in the next phase of the project, for developing effective fertiliser applications.
The experiment was conducted at Angkhang Royal Research Station and Inthanon Royal Research Station in Chiangmai province, Thailand, for the two consecutive years of 2005 and 2006. The experiment monitored the concentrations and the annual changes of 5 nutrients in both leaf samples and soil samples.
Recorded data showed that concentrations of nitrogen, phosphorus, and potassium decreased steadily as leaves grew, while concentrations of calcium and boron increased as leaves grew.
These findings matched reports from Japan, New Zealand and Australia.
Hence, a nutrient sufficiency range was suggested for tropically grown Fuyu persimmon nitrogen 2.38-2,49%, phosphorus 0.26-0.28%, potassium 1.25-1.48%, calcium 1.31-1.61%, and boron 32.58-38.27 mg/kg.
Concentrations of these 5 nutrients stabilised in 5-month-old leaf samples, since nutrients in plant did not redistribute for any growth demand.
Therefore leaf sampling was suggested on the 5-month-old leaves (at about July) for nutrient analysis of tropical growth Fuyu persimmon in Thailand.
External influences to the above suggested nutrient sufficiency range, and also the soil improvements are subjects for further investigation.
Structural differences of trees and local climate attributes are not addressed, particularly the tropical climate in Thailand and the longer growth period.
This study focused on identifying nutrient status in response to the tropical growth of Fuyu persimmon in Thailand.
Two studies were done: i) identify an optimum nutrient range, and ii) suggest a leaf sampling schedule.
Findings will be applied in the next phase of the project, for developing effective fertiliser applications.
The experiment was conducted at Angkhang Royal Research Station and Inthanon Royal Research Station in Chiangmai province, Thailand, for the two consecutive years of 2005 and 2006. The experiment monitored the concentrations and the annual changes of 5 nutrients in both leaf samples and soil samples.
Recorded data showed that concentrations of nitrogen, phosphorus, and potassium decreased steadily as leaves grew, while concentrations of calcium and boron increased as leaves grew.
These findings matched reports from Japan, New Zealand and Australia.
Hence, a nutrient sufficiency range was suggested for tropically grown Fuyu persimmon nitrogen 2.38-2,49%, phosphorus 0.26-0.28%, potassium 1.25-1.48%, calcium 1.31-1.61%, and boron 32.58-38.27 mg/kg.
Concentrations of these 5 nutrients stabilised in 5-month-old leaf samples, since nutrients in plant did not redistribute for any growth demand.
Therefore leaf sampling was suggested on the 5-month-old leaves (at about July) for nutrient analysis of tropical growth Fuyu persimmon in Thailand.
External influences to the above suggested nutrient sufficiency range, and also the soil improvements are subjects for further investigation.
Authors
K. Krisanapook, J. Fujarern, L. Phavaphutanon
Keywords
Diospyros kaki L., fertiliser, leaf analysis, leaf position, nutrient status, tropical
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