ACCOUNTING WITH FURTHER FARMERS
Technical Guidelines For Growing Green Orange On Farmland (Part 1)
Green orange is one of the main fruits in the southern provinces of Vietnam, mainly grown in Vinh Long, Tra Vinh, Hau Giang, and Soc Trang.
With high economic value, green orange is currently a popular crop among many farmers.
However, many farmers still cultivate green oranges improperly, leading to low efficiency. Also affects the agricultural environment, leading to many dangerous diseases such as root rot, green-veined yellow leaves, and the rapid decline of trees.
Green orange is planted densely on farmland, with a density of 4500-5000 trees/ha (450-500 trees/1000m2), yielding 7-10 tons of fruits/1000m2, and some skilled farmers can achieve 12 tons/1000m2. However, the fruiting cycle is short, usually only lasting for 3-5 years, and with good cultivation techniques can extend for another year before being cut down.
Viet Nga Group will share with farmers a technical article on cultivating green orange on farmland and some critical notes to ensure that green orange is produced with economic efficiency and sustainability.
1. Suitable season for planting green orange
The appropriate time to plant soursop is at the end of the dry season when the rainy season begins. Rains will create favorable conditions for the plants to develop well, quickly establish roots, and adapt to the soil better. Farmers should consider planting in around April or May. The beginning of the rainy season helps the plants develop well and produce high yields.
2. Soil preparation requirements
The design of irrigation canals and ridges depends on soil conditions such as the thickness of the soil, flooding condition during the rainy season, depth of the humus layer, the height of the ridges, planting density, etc. The surface and depth of the canals also depend on the height of the ridges.
– Due to the low rice fields, it is necessary to control the water level to avoid flooding when constructing ridges. The height of the banks should be 0.5 – 0.6 m above the highest water level in the canal.
– When constructing ridges, must not bring the humus layer or the potential humus layer to the surface to avoid affecting the growth of the plants.
– Depending on the area of the field, there may be one or more main drainage ditches, also known as the inlet ditch, which provide water to the entire region. The ditch should be placed next to the bank, opposite the primary water source, to supply or drain water quickly. A large-diameter ditch should be selected to provide enough water during high tide periods. Installing 2 ditches for water inflow and outflow is recommended to ensure good water flow in the canal.
3. Planting density
The planting density should be adjusted depending on the soil fertility. A planting distance of 1.5m x 1.5m or 1.5m x 2m (2,500 – 3,000 trees/ha) is recommended for green oranges grown on farmland.
4. Choosing seedlings
Using China limes as the rootstock for grafting is recommended as it helps green oranges withstand the flooding conditions in the Mekong Delta region. Purchasing seedlings from reputable suppliers with clear origins and guaranteed disease-free quality is also essential.
Green oranges must be watered thoroughly during all periods, especially fruit-bearing. It is best to water the plant regularly during the sunny season, ideally 1-2 times daily. During the rainy season, due to uneven distribution of rainfall, if there is no continuous rain for 3 days, it is necessary to water the plant. The watering methods can be done via the root or by installing a drip irrigation system. During the rainy season, it is essential to check the drainage system, such as ditches and canals, to ensure proper drainage and prevent flooding. It is recommended to let water flow naturally to wash away any minerals and accumulated sediment.
Please refer to the preparation information before planting green oranges for the best results. Stay tuned for the second part of the article, and wish you a successful harvest season.