Formed during the regression of the Mekong Delta, Ben Tre in the sand, which is mainly soil mounds have 14.248ha area (approximately 6.4% of the province) are distributed in throughout the district in the province, but is most concentrated in the districts of Ba Tri, Mo Cay Nam, Mo Cay Bac and Ben Tre City.
This type of land is quite suitable for the cultivation of annual and perennial color. Slightly acidic sandy soil mounds in the surface layer, poor nutrition, so much sand texture, organic-poor water holding capacity and so nutrient poor, very low fertility balance, severe protein deficiency. In areas where no cover crop, soil drainage and vulnerable surface is usually very dry.
According land area of Ba Tri district (2005): The total land area is naturally 35.553ha. In particular, shallow planting crops accounted 2.086ha, distributed mainly in the land of sand dunes. Vegetable cultivation has been so long in Ba Tri district, concentrated in Tan Thuy, An Hoa Tay and Vinh An, has brought relatively stable economic source for farmers. Lettuce and cucumbers are easy to grow vegetables, suitable for sand dunes land in Ba Tri, due to the rapid production should be grown all year round.
For the purpose of evaluating the effectiveness of organic fertilizers on productivity and quality of some vegetable crops grown on the land infertile sand dunes and evaluate the changes of some physical properties, bio-land of sand dunes after three crop cultivation, from month to month 6-2012 11-2013, Center for the Advancement of Applied Science and technology, Ben Tre has collaborated with Farmers Association Tan Shui (Ba Tri) organization assay using micro-organic fertilizer produced from coco peat (HCVS) on 2 kinds of vegetables as lettuce and cucumber plants. This type of organic fertilizer with effects such as balance and provide adequate nutrients for plants, helps plants grow better; some additional useful microorganisms to the soil; stimulate the roots, the roots help plants thrive better nutrient absorption, enhance drought tolerance, increased resistance to pests and diseases; improve soil porosity, moisture holding capacity of the soil when fertilized.
With dosage use of additional fertilizer for plants HCVS lettuce and cucumber 200kg / 1.000m2 soil, resulting in increased productivity cucumber salad than 20% and more than 25% compared with the control using use of fertilizer farmers commonly used. Initial profit increased nearly 10% compared to control. The fact that the use of HCVS, the growth indicators such as lettuce plants growing period, plant height, length and width of leaves, number of leaves on trees, tree weight; indicators of quality such as the ability to stay fresh for the leaves, leaf color is almost comparable to controls. The growth indicators such as cucumber total growth duration, time of appearance leaves, plant height, number of leaves on the trees; Indicators of quality products such as fruit diameter, length almost equivalent results.
Mr. Tran Van Ha is participating farmers commented trials: use of chemical fertilizers damage the soil, pest pressure is increasing. Meanwhile, the use of coconut HCVS from acne for good performance, we can say the equivalent of chemical fertilizers, high-yield crops; the time of harvest, the leaves are still green, still proves soil nutrients and tree leaves. According to him, the effect of the distribution HCVS will not just stop at the first season that the economic efficiency of agricultural education and will continue to manifest clearly in the following season.
These results are entirely consistent with previous studies on the effect of bio-organic fertilizer on some of the crops. The study also showed that the ability of organic fertilizers in increasing crop yields and improving the physicochemical properties of the soil.
