NY/T 3252.3-2018Industrial hemp seed -- Part 3: Technical code of practice for the production of conventional variety seed (English PDF)

3.1 Basic seed

Seeds that are produced with the pre-original seed according to the technical regulations for the production of the original seed, have the typical traits of the variety, and is genetically stable.

3.2 Qualified seed

The first generation of industrial hemp seeds that are bred from the original seeds for field production.

b) The previous crop of the plot shall be other crops or industrial hemp of the same variety, the same level and above.

5.3 Cultivation management

5.3.1 Site preparation

Before planting, deep plowing, fine raking and leveling the breeding land.

5.3.2 Base fertilizer

Fertilization shall be based on the soil fertility status. For medium fertility soil, apply

12kg~14kg of urea, 20kg~22kg of superphosphate, 7kg~9kg of potassium sulfate or compound fertilizer with the same content per 667m2. In areas where conditions permit, apply additional 800kg~1000kg of farmyard manure per 667m2.

5.3.3 Sowing

5.3.3.1 Sowing period

From the first-ten days of February to the first-ten days of June, sow when it is suitable for seed germination according to the climate and soil conditions in the north and south.

In areas with relatively dry soil, sow at 2d ~ 15d before the rainy season; or sow after the rain soaked into the soil and keep the soil moisture.

5.3.3.2 Sowing method

Use mechanical dibbling or artificial pond (hole) sowing, the sowing depth is 3cm~5cm.

5.3.3.3 Planting density

Early-maturing varieties should have 4000~6500 effective plants per 667m2; while the late-maturing varieties should have 2500~3000 plants. The lower limit should be taken when the plot fertility is good; and the upper limit should be taken when the plot fertility is normal.

5.4 Field management

5.4.1 Thinning

According to the emergence of the seedlings, thinning is carried out in the third pair of true leaf stage; and the thinning is carried out in the principle of "pulling the strong, removing the weak and retaining the middle", so that remove the too strong seedlings, the weak seedlings that are damaged by pests and diseases, deformed seedlings and miscellaneous plants. Set seedlings from 3~4 plants for each pond (hole). For the small seedlings that are damaged by pests and diseases and miscellaneous plants, they

......