[Potato yields at vermicompost applying]
2007
Grishko, Yu. V., Research and Development Inst. of Agrophysics, Saint-Petersburg (Russian Federation) | Kiru, S.D., The N.I. Vavilov All-Russia Research and Development Inst. of Plant Growing, St.-Petersburg (Russian Federation)
The influence of vermicompost on the yield of 2 potato varieties (mid-ripening Sante and mid-early ripening Granola) was under study in 2002-2006 in the conditions of St Petersburg region. The yield of potato increased at raising the dosage till 8 000 kg per ha and it started to fall down at a dosage of 12 000 kg per ha and 16 000 kg per ha. The cultivars had lower yields (nearly in 2 times) and bad marketability under unfavorable climatic year conditions in compare with the favorable ones if vermicompost was not used. In contrast tuber mass and number remained high at the usage of vermicompost and at a dose of 8 000 kg per ha one tuber mass and its marketability raised also (average additional yield was about 40%). That could express a positive anti-stress effect on potato plants. It was hypothesized that vermicompost applying was more effective at growing of potato varieties with a long vegetative period. The dosage of 4 000-8 000 kg per ha was enough for early-maturing varieties and it should increase till 12 000 kg for slow-maturing ones. The manure applying at a dose of 50 000 kg per ha had also a significant effect but the result was that the both varieties were affected by skin necrosis of potato. The vermicompost applying did not provoke such diseases during 5 years of experiment
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