Cultivation techniques of Oenanthe javanica
Wet cultivation of water celery refers to dry land plant The cultivation method of wetting irrigation and soil softening is often carried out.
1. Variety selection. Water celery varieties with late maturity, strong cold resistance, high quality and high yield were selected.
2. Soil preparation and border making. Fertile loam and clay loam were selected, especially the dry vegetable rotation. In September, we will apply enough basic fertilizer to the field, 5000 kg of human manure or rotten stable manure, 50 kg of SSP, and 1 kg of borax per mu. We will turn the fertilizer into the soil, plough and level it, and make a border of 1-1.2 meters wide and 12-15 cm high, with a width of 50 cm. Shallow furrows with a depth of 5-6 cm should be opened at an interval of 30 cm on the border surface. The furrow should be flat and straight.
3. Seeding and covering soil. After the furrow is opened, the sprouting stems can be arranged in the ditch along the length. If one seed plant is not long enough, a section can be folded off from other species to make up for it. After sowing, the seed should be covered with 1-2 cm of moist fine soil to cover the seed stem, so as to avoid direct sunlight. If the soil is relatively dry, it is better to irrigate the ditch first, and then to discharge seeds after the water seeps down. Then cover with sunshade net or straw to keep moisture.
4. Field management. ① Water management. In the future, we should not water the border frequently. In the early high temperature season, it is suitable to irrigate in the morning, but in the later stage the temperature drops, so it is suitable to irrigate at noon. In case of heavy rain, drainage should be carried out immediately until there is no ponding in the furrow. Always keep the border moist. ② Top dressing by stages. 5 kg of urea or manure per mu. In vigorous growth period, the amount of rotten manure or ternary compound fertilizer was 1-2 times more than that of seedling stage. In the later stage, when the temperature was about 15 ℃ in late October, the plant entered the ramet stage. When the plant height reached 30-35 cm, the decomposed manure was applied with the concentration of 40% - 50%. ③ Soil softening. Generally, in late October, when the temperature drops below 15 ℃, the soil is gradually cultivated after the stems and buds are unearthed, and the soil layer is deepened. Every time the soil is added, the water must be poured through. Generally, the soil is cultivated 3-4 times in the growing period, with a thickness of 7-9 cm. The more tender, the deeper the celery, the better the quality. In order to prevent the soil from crushing the water dropwort, a board can be inserted between two rows of plants. The mud excavated from the ditch is gently poured along the board, leveled and patted tightly. Only 4-5cm of the upper leaves are exposed. After the soil is compacted, the board is pulled out and the next row is continued. And so on. Then water in the ditch, the water depth is 3-5 cm lower than that before soil cultivation, which ensures that the root system can absorb water (www.nczfj. Com) and does not cause the newly cultivated plants to rot due to excessive humidity.
After soil cultivation and before harvesting, the depth of irrigation in the ditch should be only to the root position, so as to prevent the plant from rotting due to high water level. At the same time, combined with soil cultivation, weeds should be removed. When most of the leaves of Oenanthe javanica are higher than the soil surface, insert a spade into the middle of the cultivated soil and break it off to close the gap left after removing the wood board during soil cultivation. The cultivated soil is close to the water celery plant for softening. In addition, in order to promote plant growth in the later stage, spraying 50-100 mg / L gibberellic acid on leaves 7-10 days before harvest can also be used.
5. Timely harvest. The water celery can be harvested about one month after soil cultivation, the early planting in late November, and the late planting can be extended to the late March of the following year. At this time, the petiole of Oenanthe javanica has softened and turned white, and many new stems with tender yellow leaf buds have been grown. The basal stem nodes have not been elongated, and the adventitious roots are very few. During harvesting, the cultivated soil is dug out with a rake row by row, and then the soil is scooped from the root of the water celery with a spade row by line. Then, the old and green leaves are removed, cleaned, bundled and put on the market. If the water celery is wetted due to weather or market factors, the harvest can be delayed.
6. The field should be selected separately and the top dressing should be done only once after the seedlings are fully grown. No topdressing is needed before winter to prevent the plant from overgrowth. In the vigorous growth period, attention should be paid to the selection of seeds, and the plants with poor growth not in line with the characteristics of the varieties should be removed. When the temperature rises to about 15 ℃ in the spring of the following year, the aboveground parts should be cut off and fertilized once to promote the sprouting of new seedlings. After 30 days, the plants were thinly cut and densely divided, and 3-4 seedlings were left in each hole, and appropriate phosphorus and potassium fertilizer were applied to ensure the old and healthy stems. When the temperature is over 30 ℃, grass should be covered between rows to protect roots.
413002 Wang Dixuan, Xu Xuee, vegetable Bureau of Heshan District, Yiyang City, Hunan Province