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• Integration of Mineral Fertilizer with Organic Fertilizer for Improved Tomato Fruit Yield and Quality

  Nguyen Thi Loan, Nguyen Ngoc Hung, Tran Thi Thiem, Thieu Thi Phong Thu

  Received: May 15, 2023 / Accepted: Jun 12, 2024 / Published: Jun 28, 2024

   Abstract PDF

  This study aimed to evaluate the effects of chemical and organic fertilizers in different fertilization regimes on vegetative growth, fruit yield, and fruit quality of tomatoes. The experiment was arranged in a randomized complete block design with three replications in the winter season of 2021. The treatments were: no fertilizers, application of NPK fertilizer (15-15-15) at a rate of 1000 kg ha-1, application of chicken manure at a rate of 12 tons ha-1, and three treatments of the combination of NPK fertilizer and chicken manure at the ratios of 70:30, 50:50, and 30:70, respectively. The results indicated that the combination of chemical and organic fertilizers led to improved vegetative plant growth. Combining 70% of NPK fertilizer with 30% of chicken manure gave the maximum fruit yield component values and fruit yield of tomatoes. Adding chicken manure to the fertilization regimes also led to better fruit quality. The integrated fertilization increased the TSS and vitamin C values, and when 50-70% of the chemical fertilizers were substituted with chicken manure, the sugar content and total acid increased in the fruits. The color at the red stage was more intense in tomato fruits treated with the NPK fertilizer and integrated fertilization regimes compared to those from organic fertilization.

• Effects of Mineral Fertilizer Doses and Ratios on Tea Yield and Quality

  Tran Xuan Hoang, Vu Ngoc Thang, Dang Van Thu, Nguyen Ngoc Binh, Nguyen Van Toan, Dinh Thai Hoang

  Received: Oct 27, 2020 / Published: Aug 10, 2021

   Abstract PDF PDF

  Mineral nutrients are essential to plant growth and development. The present study aimed to evaluate the effects of mineral fertilizer doses and N:P:K ratio on growth, yield, and raw material quality of the tea variety PH10 to improve the production of high-quality tea products. The field experiment was conducted from 2015 to 2017. A two-factor experiment was designed by split-plot design with three replications. The mainplot treatments were three fertilizer doses of N  for one metric ton of fresh shoot products (30, 40, and 50 kg N ha-1). The subplot treatments were two NPK ratios (3:1:1 and 3:1:2). Plant height, leaf canopy, plant diameter, shoot yield parameters, shoot components, biochemical compounds, and sensory quality for Oolong and Sencha tea products were evaluated. The results showed that increasing fertilizer doses from 30 up to 40 kg N per ton of fresh product improved remarkably growth, yield, and tea quality of PH10 variety. Different fertilizer ratios resulted in variations in plant growth, the content of carbohydrate, sensory quality for taste and flavor as well as total sensory quality with higher values at NPK ratio of 3:1:2. Applying mineral fertilizer with an NPK ratio of 3:1:2 and 40kg N per ton of fresh shoot products was recommended to bring about the most benefits of tea yield and quality as well as economic profit.