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All Journal Caraka Tani: Journal of Sustainable Agriculture
Nguyen, Hien Huu
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Agriculture, Biological Sciences & Forestry

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Relationship Between Leaf Nutrient Concentrations with Fruit Yield and Quality of Pummelo (Citrus maxima (Burm.) Merr.) in Nghe An Province, Vietnam Nguyen, Hien Huu; Tran, Minh Xuan; Tai, Toan Nguyen
Caraka Tani: Journal of Sustainable Agriculture Vol 41, No 1 (2026): January
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/carakatani.v41i1.106911

Abstract

Pummelo is a high-value cash crop in Vietnam, where optimizing cultivation practices requires a profound understanding of the correlations between leaf nutrient concentrations and fruit quality.This study investigated the correlations between leaf nutrient levels and the yield and quality of the ‘Quang Tien pink’ pummelo cultivar. The research was conducted in 2024 across 25 pummelo orchards in Nghe An Province. Leaf samples were analyzed for concentrations of N, P, K, Ca, Mg, Zn, Mn, Cu, and Fe. Fruit characteristics evaluated included fruit weight, circumference, peel thickness, edible portion, juice volume, juice pH, total soluble solids (TSS), titratable acidity (TA), and the TSS/TA ratio. The findings demonstrated that foliar N, P, and K concentrations were significantly and positively correlated with fruit circumference, fruit weight, juice volume, TSS, juice pH, and TA. In contrast, P and K levelswere negatively correlated with peel thickness (r = -0.639, -0.906, respectively). Leaf Ca concentration was positively correlated with peel thickness (r = 0.537) but negatively associated with fruit weight (r = -0.406) and TSS (r = -0.404). Additionally, Zn, Cu, Fe, and Mn concentrations showed significant positive correlations with TSS (r = 0.723, 0.660, 0.443, and 0.570, respectively), while Zn and Cu were negatively correlated with peel thickness (r = -0.539, -0.456, respectively). These results establish a robust scientific baseline for precision nutrient management strategies to maximize the yield and fruit quality of pummelo.
Effects of Calcium and Magnesium Application on Yield and Fruit Quality of Oranges in Thanh Hoa Province, Vietnam Nguyen, Hien Huu; Thu, Dung Cao Thi; Ho, Nhung Thi; Nguyen, Mai Thanh Thị; Thai, Lam Ngoc; Nguyen, Hien Thi
Caraka Tani: Journal of Sustainable Agriculture Vol 41, No 2 (2026): April
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/carakatani.v41i2.116840

Abstract

Calcium (Ca) and magnesium (Mg) are essential secondary macronutrients that govern plant growth, fruit development, and physiological stability of citrus production. Specifically, these elements play a crucial role in mitigating fruit cracking and enhancing fruit quality. The objective of the study was to determine the optimal application rates of Ca and Mg to maximize yield and fruit quality of Xa Doai oranges in Thanh Hoa Province, Vietnam. The experiment was conducted from December 2024 to December 2025 on seven-year-old Xa Doai orange trees, using a randomized complete block design and 3 replications. Treatments consisted of 3 levels of Ca (2.0, 2.5, and 3.0 kg tree-¹) and Mg (0.5, 1.0, and 1.5 kg tree-¹). The results showed that the application of 3.0 kg CaSO₄.2H₂O and 1.5 kg MgSO₄.7H₂O were effective in improving soil pH (6.35) and resulted in high exchangeable Ca and Mg (1,012.60 and 188.33 mg kg-¹, respectively) and the lowest level of fruit cracking (10.82%). Conversely, the highest yield (50.84kg tree-¹), total soluble solids (TSS, 11.53%), and TSS/TA ratio (25.61) were obtained with the lower application rates of 2.0 kg CaSO₄.2H₂O mixed with 0.5 kg MgSO₄.7H₂O. Analysis results indicated that the exchangeable Ca in soil was negatively correlated with fruit weight (r = -0.77), fruit circumference (r = -0.70), fruit cracking (r = -0.90), TSS (r = -0.75), and TSS/TA ratio (r = -0.94), but positively correlated with peel thickness (r = 0.88). The results offer a viable basis for maximizing fertilization in the production of oranges.
Co-Authors Ho, Nhung Thi Nguyen, Hien Thi Nguyen, Mai Thanh Thị Tai, Toan Nguyen Thai, Lam Ngoc Thu, Dung Cao Thi Tran, Minh Xuan