Hội thảo nghiên cứu và khuyến nông để phát triển sản xuất cây có củ ở Việt Nam. Hà nội, 2003

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Application of farmer field school to transfer the advanced technology on soil fertility improvement to farmers for root crop development in Soc Son, Hanoi

The Queensland University collaborated with the National Institute for Soils and Fertilizers of Vietnam in project on “Capacity building for agriculture and rural development program in Vietnam – (CARD)”, funded by Australia Agency for International Development- AusAID. Purpose of this project is "Integrated soil fertility management for meeting the nutrition requirement of root crops in the Northern Vietnam". Project has been being run from July 2001 to December 2003. Participatory rural appraisal (PRA) and farmer field school (FFS) manuals are main tools used for project activities. With FFS tools, training and transferring the new technologies to farmer are successful methodology that should be applied for other crops and locals to developed agriculture in future. Farmers should be central element for FFS. The purpose, activities should be generated from their requirements.

Effect of the use and management of soil fertility for cassava cultivation on farmers’ fields

The paper presents several measures and technologies for using and managing soil fertility at cassava cultivation sites in Dong Rang (Luong Son, Hoa Binh), Kieu Tung (Thanh Ba, Phu Tho), Thong Nhat and Bao Thanh (Phu Ninh, Phu Tho). After 7 years of applying hedgerow farming, intercropping, reply cropping, appropriate fertilization, new varieties…several results gained as follow: 1. Hedgerow farming is one of effective measures for cassava cultivation on sloping lands: decreased erosion by 25% to 50% compared to control. Tephrosia Candida and Vetiver grass are well evaluated by farmers using as hedgerows for cassava fields. 2. Cassava intercropping with peanut/or rely cropping with taro in combination with hedgerow establishment, appropriate fertilization can minimize erosion by 50-90% compared to control increased cassava yields by 20%, contribute to higher income for farmers households. 3. Improvement of soil fertility for sustainable cassava farming on sloping lands by biomass returning into the soil and applying fertilizers.

Participatory technology development for soil fertility management (An overview of the project on "Soil fertility management for meeting the nutrient requirements of root crops in Northern Vietnam")

The effect of different N, P, K rates on sweet potatoes grown on coastal sandy soils in Thanh Hoa province

Through the experiment of N, P, K fertilizers on sweet potato varieties on the spring on coastal sandy soils in Thanh Hoa, the authors showed several results: N, P, K fertilizers was closely affect on the growth and yield of sweet potato varieties. The application of 60N + 30P2O5 + 90K2O + 10 tons farmyard manure in the spring on coastal sandy soils in Thanh Hoa gave the highest yield and good plant yield.

The effect of fertilizers to sweet potato yield on degraded soil in Soc Son district, Hanoi

In order to find the most benefit fertilizers for sweet potato to be applied by farmers, field trials were carried out by participatory of farmers in (Farmer Field School - FFS) at Soc Son, in autumn - winter sweet potato 2002. The results of field trials showed that: sweet potato has good response to the fertilizer. Farmyard manure (FYM) applied as rate of 10 t/ha could increased root yield by 34%, compared with control. Application of inorganic fertilizers could increase root yield by 8.5-75.2%. Combination of inorganic fertilizers and organic manure could increase root yield by 92%. Sweet potato yield have been given the highest by application of (80N, 60P2O5, 90K2O/ha) combined with FYM. In the first trial, K51 variety had highest root yield on degraded soil in Soc Son.

The effect of soil erosion on the soil fertility and management of soil nutrient under cassava plantation

Cassava is planted on the most of sloping lands in Vietnam. It could cause serious soil erosion and soil to be depleted. Erosion could yearly bring the depth of 2.6 to 12.7 mm, estimated by 98.6 t/ha soil out off land surface. Cassava intercropped with leguminous species as peanut, black bean can reduce 47.8-76% of soil loss and cassava yield can be increased by 22.8 –68.4%. Application of mineral fertilizers increased cassava yield by 20-112% compared to control. Combination of organic manures, mineral fertilizers and hedgerow farming increased cassava and intercropped peanut yields with average of 43-46% compared to the application of organic fertilizers only. The nutrient balance in these areas was positive, high income and low soil erosion.