Grain Yield and Gross Return above Fertilizer Cost with Parameters Relating to the Quality of White Rice Cultivated in Rainfed Paddy Fields in Cambodia

Srun Khema, Soriya Rin, Akiko Fujita, Kea Kong, Chhay Ngin, Mana Kano-Nakata, Akira Yamauchi and Hiroshi Ehara ()
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Srun Khema: General Directorate of Agriculture, Ministry of Agriculture, Forestry and Fishery, Phnom Penh 12158, Cambodia
Soriya Rin: Faculty of Agriculture, Royal University of Agriculture, Phnom Penh 120501, Cambodia
Akiko Fujita: Bioinnovation Research Office, Satake Corporation, Higashi-Hiroshima 739-8602, Japan
Kea Kong: General Directorate of Agriculture, Ministry of Agriculture, Forestry and Fishery, Phnom Penh 12158, Cambodia
Chhay Ngin: General Directorate of Agriculture, Ministry of Agriculture, Forestry and Fishery, Phnom Penh 12158, Cambodia
Mana Kano-Nakata: International Center for Research and Education in Agriculture, Nagoya University, Nagoya 464-8601, Japan
Akira Yamauchi: Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
Hiroshi Ehara: International Center for Research and Education in Agriculture, Nagoya University, Nagoya 464-8601, Japan

Sustainability, 2022, vol. 14, issue 17, 1-17

Abstract: This study aims to compare the grain yield, gross return above fertilizer cost (GRAFC: (paddy sales)–(fertilizer cost)), and several parameters relating to the quality of white rice cultivated with different soil-specific nutrient management in 14 provinces where different soil types are distributed. The grain yield tended to increase with increased fertilizer application; however, the relationship between the fertilization rate and the yield was not linear in areas where clay soil dominates. In cases of popular varieties cultivated from the northern to southern province, the amount of fertilizer applied was up to 163 kg ha −1 (sum of N-P 2 O 5 -K 2 O), and the GRAFC and the fertilization rate showed a nonlinear relationship, with a peak of around 120 kg ha −1 fertilization. The nitrogen concentration recognized as a negative factor for the quality of rice tended to increase with an increasing fertilization rate, and the carbohydrate concentration and carbohydrate/protein ratio that are a positive factor for the quality were related negatively with the fertilizer rate. The amylopectin concentration in white rice was positively related with the carbohydrate concentration, which decreased with an increasing fertilization rate. The levels of fertilizer application required to achieve a higher yield, GRAFC, and the maintenance and improvement of parameters relating to grain quality were different.

Keywords: carbohydrate; fertilizer; grain yield; gross return above fertilizer cost; protein; production cost (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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