If it is a 56 1 hole seedling floppy disk, 40-45 pieces need to be prepared per mu, and if it is a
If it is a 56 1 hole seedling floppy disk, 40-45 pieces need to be prepared per mu, and if it is a 434-hole seedling floppy disk, 50-60 pieces need to be prepared per mu. Before emergence, the temperature should be controlled at 30-32℃, and ventilation should be carried out when it exceeds 35℃. After emergence, the temperature is controlled at 20-25℃, and ventilation is required when it exceeds 25℃. In the second leaf stage, the temperature is controlled at about 20℃, and the management is mainly based on drying, so as not to roll leaves or irrigate, and the irrigation depth does not exceed the plane of the seedling tray. 1 heart after 3 leaves, remove the plastic film and topdressing according to the seedling condition.
1. How many seedling trays are used for an acre of land?
1, number of seedling trays
(1) The number of seedling trays to be prepared per mu of land is related to the specifications of seedling trays. At present, floppy disks for rice seedling are mainly divided into two specifications: 56 1 hole and 434-hole.
(2) If you use floppy disks with 56 1 hole, you need to prepare about 40-45 disks per mu. If you use 434-hole floppy disks to raise seedlings, you need to prepare about 50-60 sheets per mu.
2. Sowing amount
(1) If it is hybrid rice, sow 1-2 seeds in each hole of the seedling tray, and the seed consumption per mu is about1.2-1.3kg. If it is conventional rice, sow 4-6 seeds in each hole of the seedling tray, and the seed consumption per mu is about 4-6kg..
(2) Generally, sowing is divided into three times. When sowing for the first time, sow 40% seeds; When sowing for the second time, 40% of the seeds are also sown; When sowing for the third time, sow 20% of the seeds. After sowing, press the seeds with a broom and scrape the seeds out of the hole into the hole. Avoid seed waste.
Second, seedling management of seedling tray
1, budding stage
(1) After sowing, the first leaf is mainly kept warm and moisturized before spreading.
(2) Before emergence, the temperature should be controlled at about 30-32℃, and when it exceeds 35℃, it should be ventilated to cool down.
(3) After emergence, the temperature is controlled at about 20-25℃, and when it exceeds 25℃, it is ventilated to cool down.
(4) After the needle is erected, quickly remove the covering to prevent the seedlings from growing white.
2,2-leaf stage
Spraying paclobutrazol during (1) 1 leaf to 1 leaf to control seedlings.
(2) Give priority to stems, and promote the roots of seedlings to penetrate into the soil, so that the leaves do not roll, and the irrigation depth does not exceed the plane of the seedling tray.
(3) The temperature is controlled at about 20℃, and the film can be uncovered in sunny days.
3, 3 leaf stage to transplanting
(1) Remove the plastic film in time after the seedlings grow to 3 leaves 1 heart.
(2) Apply wedding fertilizer according to the growth of seedlings. Generally, about 5-7 days before transplanting, 2.5 kilograms of urea should be applied (sprayed) per mu.