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First, choose a good variety
According to different cultivation purposes, choose different varieties of virus-free sweet potato. Starch processing type selection Xushu 18, fresh food, baking type selection Beijing 553 or golden potato, vegetable selection type Xushu 34. In the 1970s, Xushu 18 had been widely promoted, and the variety was seriously degraded. After detoxification, it exhibited excellent plant species and the yield increased exponentially. Beijing 553 and Xushu 34 have the characteristics of wide adaptability, strong stress resistance, and high yield.
Second, apply base fertilizer
The detoxified sweet potato grows vigorously and can easily lead to plant growth. More organic fertilizer should be applied, less nitrogenous fertilizer should be used, and basal fertilizer should be the main ingredient, supplementing topdressing, controlling nitrogen and phosphorus and increasing potassium. The ratio of base fertilizer and top dressing is 8:2. Generally, more than 3 Mushi farmyard fertilizers, 50 kg of superphosphate, 10 kg of urea, 15 kg of potassium sulfate, or 40 kg of sweet potato fertilizer with 4% content.
Third, timely ridging
In mid-June, the deep trenches are ridged, with a ridge spacing of 40 cm and a ditch depth of 25-30 cm.
Fourth, reasonable dense planting
Detoxification of sweet potato growth potential, should not be too dense. According to the row of ridges and ridges, the plant spacing is 35 centimeters and 4750 trees per mu. In the nursery field, we choose the vine which grows normally and robustly, cutting it into a length of about 30 centimeters, and planting it with a planted three-leaf planting technology. The 3 leaves of the lower part of the potato seedlings will be naturally flattened and buried in the soil. Be careful not to break the petiole and leave 1 to 2 leaves at the top. Planting time is usually in the afternoon, while planting and pouring to ensure survival.
V. Field Management
The first is to apply acetochlor 1000 grams per acre to water 50 kg per acre 2 to 3 days after the planting of the non-toxic potato seedlings. Chemical weeding is performed. After spraying, the temporary yellowing of the potato leaves is normal and has no effect on the yield. The second is to chase a seedling about 15 days after planting, topdressing 10 kg of urea, prompting early-onset trees and early tubers. The third is the timely prevention and treatment of Spodoptera litura, leaf roller moth, bridge-building insects and red spider. Control methods are the same as conventional control. Fourth, in the middle and late August, 50 grams of water per acre with 15% paclobutrazol was chemically regulated and 50 kg of water was controlled. Fifth, potassium dihydrogen phosphate was sprayed on the leaves in mid-September to promote the expansion of potato chips. The sixth is to take care of the exclusion of water in the field during the rainy season.
High-yield Cultivation Techniques of Virus-free Summer Sweet Potato
After being detoxified, sweet potato has good sprouting ability, many seedlings and strong seedlings, strong growth potential, early potato growth, rapid enlargement, high yield, good quality, and significant yield increase. The general increase rate is 35%, and the higher ones are about twice as productive. Its main cultivation techniques are: