Efficiency of variety agrotechnics methods for new early potato varieties of Russian breeding
In the article it was studied the influence of separate elements of variety agrotechnics on the productivity of new early potato varieties Meteor and Krepysh with the cultivation for food purposes under conditions of Central Nonblack Soil Zone. The soil of the experimental plot is flood-plain, alluvial, medium-loamy, which is characterized by the following agrochemical features: humus content (according to Turin’s method) is 4.3...4.5 %, mobile phosphorus content (according to Kirsanov’s method) is 520.8.539.7 mg/kg, potassium content (according to Kirsanov’s method) is 196.0.214.0 mg/kg soil, pHs is 6.7.6.76, hydrolytic acidity is 0.55 meq/100 g. The experiment plan provided for the study of two variants of potato planting density (55.57 and 45.47 thousand tubers per a hectare), and also three methods of usage of 0.4 % solution of the preparation Akvarin-12 (presowing treatment of tubers, spraying of crops at the budding and the combination of these methods). The largest area of assimilation surface in the experiment was noted in variety Meteor, 34.1 thousand sq. m/ha. The combined processing of tubers and tops by Akvarin-12 increased the value of this index by 0.97 thou sq. m/ha, the spraying at the budding - by 0.82 thou sq. m/ha, the wetting of tubers before planting - by 0.31 thou sq. m/ ha. The efficiency of studied agro-methods was determined by variety intensity. The highest productivity in the experiment was noted in Meteor, 52.7 t/ha, the lowest in Zhukovsky ranny, 30.9 t/ha. The usage of 0.4 % solution of chelate fertilizer Akvarin-12 for spraying of tubers and tops ensured the increase in productivity 7.5t/ha for Meteor, 4.8 t/ha for Krepysh, 5.7 t/ha for Zhukovsky ranny; with tops spraying these values were 5.4, 1.9 and 2.7 t/ha correspondingly. For all varieties the efficiency of combined influence of agro-methods was higher than the sum of effects of its separate application.