Strengthening aquatic vegetable cultivating management
At present, the growing period of aquatic vegetables is also the beginning period of various pests and diseases. Well-managed middle farmland management and pest control work is the key to ensuring normal growth of aquatic vegetables and achieving high yields and harvests. The focus should be on doing the following:
First, strengthen timely fertilizer
The total amount of fertilizer needed for aquatic vegetables during the whole growth period should be dominated by basal fertilizer. Top dressing should be applied according to the soil fertility and plant growth. Lotus root topdressing: the first mention of Miao Fei (20-30 days after planting), when the medlar grows 1-2 leaves, Mushi urea 20 kg or ammonium bicarbonate 40 kg (Note: Ammonium bicarbonate can not be stained on the loquat leaf , to prevent burns and loquat leaves; the second time in the temporal lobe seal line, Mushi compound fertilizer (15:15:15) 40 kg or compound fertilizer 20 kg plus urea 20 kg; the third time in the beginning of the indwelling (after flowering ), Mushi urea 20 kg, compound fertilizer 15 kg.
Sagittarius fertilizer should be dominated by nitrogen fertilizer in the early stage, and phosphorus and potassium fertilizer should be supplemented in the later stage to facilitate bulb enlargement. Dressing can generally be chased 2-3 times, for the first time in the early growth period (after living trees), Mushi 15 kg of urea or 30 kg of ammonium bicarbonate; the second fertilization in the mid-growth, Mushi fertilizer 20 kg plus urea 15? 20 kg; the third time in the late growth period, Mushi compound fertilizer 20-30 kg (according to the seedlings may be). Fertilizers should be applied between rows and low to prevent chemical fertilizers from sticking to leaves on the leaves of the Sagittaria.
Second, strengthen pest control
In the mid-growth stage of lotus root, the main diseases are corruption, leaf spot, insect pests such as aphids and Spodoptera litura. (1) Lotus root spoilage disease (also known as blight disease): It is the first major disease in the production of lotus root. It infects underground stems and causes rot. In severe cases, the field is yellow, and it looks like a fire. When disease occurs, 75% chlorothalonil 0.5 kg plus 30 kg of dry earth can be mixed and thrown into a shallow paddy field. (2) Leaf spot of lotus root: A common disease in the lotus leaf, with pale brown spots on the leaves, causing the leaves to dry. Control methods: timely removal of diseased plant residues. In the early stage of disease, spraying with 25% carbendazim 600 times or 75% chlorothalonil 1000 times with aphid control. The commonly used insecticides are 40% omethoate and 65% enemies.
The diseases of Sagittaria are mainly smut and base rot. The main insect pests are locusts. Smut is mainly harmful to leaves and petioles. It is prone to occur under conditions of high temperature and high humidity (26°C to 28°C). It can be controlled by 50% carbendazim or 15% triadimefon. At the beginning of the disease, triadimefon (triaden), carbendazim and thiophanate-methyl were sprayed and used for 10 days for a total of 3 to 4 consecutive days until the weather turned cold. Base rot can be sprayed 1-2 times with 72% agricultural streptomycin. Locusts were treated with 40% omethoate.
Third, strengthen water management
Aquatic vegetables must be kept dry throughout the growing season. Generally, mid-growth lotus root requires 15-20 cm water level, Sagittaria 10 cm water level, late growth stage requires lotus root 10 cm water level, Sagittaria 5 cm water level, which is conducive to plant growth and enhance plant resistance. Converse.
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