Main techniques and key production measures for high yield cultivation land
First, choose the site preparation. Should choose a deep, fertile, well-drained sandy loam soil. In the first year of winter or early spring, the soil is deep-turned over 25 cm. At the same time, 2000-3000 kg of compost of compost and 25 kg of superphosphate are used as base fertilizer per acre. Afterwards, the leveling process is meticulous, generally 1.3 meters wide. Special attention should be paid to replanting yellow earthworms. This is also a key measure to be taken into consideration when selecting land.
Second, choose planting. In general, cultivated yellow plants use rhizomes as propagation materials, and production plants are called plants. Rehmannia glutinosa plants are generally selected from the last year's cultivation in July-August. This is due to the high yield, good quality, and ability to prevent the degradation of the varieties when they are used as seedlings. Before planting, plant the tree to the head and tail and take the middle section. Then cut into small pieces 3 to 6 centimeters in length, and leave two to three buds for each segment. The cuts are stalked with plant ash, dried slightly and then seeded. The average planting density is 30 to 40 centimeters, and the plant spacing is 25 to 30 centimeters. On a good hoe, dig a 3-5 cm deep hole, lay 1-2 sections in each hole, cover 1 fire and earth ash mixed with manure, and cover it with fine soil. Need 40-60 kg per acre. Pay attention to the use of back planting when selecting the seedlings to avoid the use of small commodities. At the same time, the planter must remove the old mother. That is, planting plants in the early days.
Third, field management.
(1) and time seedlings fill seedlings. When the seedling height is 10-12 cm, the seedlings are started and 1 strong seedling per hole is left. In the event of a shortage of plants, they should be planted in a timely manner on a cloudy day. When growing plants, they should be raised with soil. This has a high survival rate;
(2) Weeding and weeding. Rehmannia glutinosa root into the soil is shallow, cultivator should be shallow, to avoid the roots, the weeds around the seedlings must be removed by hand, after the plant seal line, stop the cultivator;
(3) Dressing. In order to promote rhizome development and enlargement, when the line is closed, 1 layer of fire and earth ash shall be applied between the rows to promote the development of rhizome development. Plants grow robustly;
(4) Irrigation. In the early period of Yellow River, the amount of water needed is large, which should be diligently watered, and the later period is the period of underground rhizome expansion. Water should be saved. During the rainy season, attention should be paid to timely drainage to prevent the occurrence of root rot.
(5) Except string roots. In addition to the main root of yellow, but also along the surface grow slender underground stem, called string roots, these string root loss more nutrition, should be promptly eradicated.
Fourth, pay attention to the prevention of pests and diseases. The diseases of Rehmannia root mainly include spot blotch, ring rot, and wilt disease. These diseases generally begin to occur in early May and occur from June to July. They should be treated promptly; insects include spider mites, tigers, and earthworms. According to the conventional method of treatment, pay attention to the selection of pharmaceutical agents should avoid the use of highly toxic pesticides.
V. Harvest processing. In spring, the yellow land should be excavated in time when the stems and leaves on the ground are yellow before and after November of that year. When the excavation is completed, a 35 cm deep ditch should be opened at one end of the crucible, and the rhizomes should be carefully removed in turn; the processed ground yellow should be processed into the ripening ground using a special oven to become a commodity.
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