Cultivation and management techniques of Dongshi early pomelo

   I. Variety characteristics

   Dongxizao pomelo is an extra precocious pomelo variety selected from the variation of pomelo in the late 1960s at Dongfeng Farm Experimental Station in Xishuangbanna. Dongxizao pomelo tree is strong, the tree posture is open, the leaf is long, oval, the fruit is Obovate, the average single fruit weight is 1000-1300g, the pericarp is yellow, easy to peel, and the thickness is 1.2~1.5cm. The single fruit has more than 100 seeds, the flesh is yellowish, the texture is delicate and dregs, and there is no peculiar smell; the content of soluble solids is 0.5%, the acid content is 0.5g/100ml, and the quality is good; the fruit is early, high and stable, and the high yield of 5-year-old trees can reach 200kg. The fruit ripens in late August.

The adaptability and planting area of    is the most suitable for planting in the areas where the annual average temperature is 21 ℃, the annual active accumulated temperature of ≥ 10 ℃ is 6500-8000 ℃, the annual precipitation is 1000~2000mm, the soil pH value is 5.5-6.5, the topography is flat, the drainage is good, the soil is loose, and the soil layer is deep and fertile.

The picture shows: grapefruit

   II. Establishment and cultivation of Dongshi early pomelo

   1) Garden selection. Dongshi early pomelo likes the humid natural environment, if it develops to the mountain, it must choose the back to the mountain, and the mountain concave land with forest on the top of the mountain should build a garden with a slope of less than 30 °to form a high-level terrace to prevent soil erosion and achieve the purpose of water, fertilizer and soil conservation.

It is better for    orchard to face south or southeast, followed by northeast. It is not suitable to build a garden in high mountains, drought and thin land.

   2) dig holes in the ground and apply sufficient base fertilizer.

   hole digging should be carried out in winter, the distance between plants and rows is 4m × 5m, and the hole size is 1m × 1m × 0.6m. It is better to dig trenches when conditions are available. Each hole should be filled with 100kg, calcium superphosphate 1.5kg and mixed with topsoil, and the filling soil should be about 10cm higher than the ground, so as to avoid the decline of soil seedlings after planting, and about 33 trees should be planted per mu.

   3) planting season and method.

   grafted seedlings should be planted before spring shoot germination or when spring shoot matured (the Beginning of Summer), the grafting mouth should be higher than the ground 7cm, and the mountain area should be planted in the middle of the ladder in order to expand the root group. Before transplanting, the seedlings first touch the roots with yellow mud, when transplanting, the soil holes are dug up, the seedlings are placed in the middle, the plant should be erect, the roots are stretched around, and then the topsoil is filled and compacted, that is, the roots are watered, and then the loose soil is covered with grass to prevent the soil from sinking or stagnant water, and then covered with grass to protect moisture, and it is best to plant with soil when conditions are available, such as watering continuously for 3 days for 5 days in sunny days to ensure survival.