Effect of bioorganic fertilizers on the productivity of foreign tomato varieties and hybrids in the conditions of southeast of Kazakhstan

Abstract

In the conditions of the foothill zone of Kazakhstan southeast on tomato culture on variety - standard Ogonyok-777 (Kazakhstan), variety Barin (Russia), Shuruk (Netherlands) and Falkon hybrids (Turkey) the effectiveness of 7 types of bioorganic fertilisers of domestic and foreign production - Biohumus, manure, BaraebongOrganicFertilizer, MEGAVit, Terra Sorb foliar, Black Jack and liquid humic fertiliserwere studied. The study was carried out at the research station of the Regional Branch "Kainar" of "Kazakh Research Institute of Fruit and Vegetable Growing" LLP according to the following accepted methods: methods of experimental work in vegetable growing, methods of agrochemical research, methods of field experiment in vegetable growing, methodical recommendations "Transition from traditional to bioorganic farming in the Republic of Belarus". High efficiency of the studied fertilisers on foreign varieties and hybrids of tomato was established. Yield of varietyBarin under the influence of different types of bio-organic fertilisers increased by 35.43-61.40 %, hybrid Shuruk - by 31.09-62.18 %, hybrid Falkon - by 39.54-67.65 %. The highest yields of tomatowere obtained by using Biohumus (10 t/ha) and manure (40 t/ha) and Baraebong Organic Fertiliser (10 t/ha). Nitrate content in tomato of variety Ogonyek 777 was 35-107 mg/kg, variety Barin was 42-116 mg/kg, hybridShuruk was 56-134 mg/kg and hybrid Falkon was 37-128 mg/kg at MCL of 150 mg/kg. Higher levels of nitrates (2.5-3.5 times more than the control) were observed in products grown with mineral fertilisers separately and in combination with biofertilisers. On variants with biohumus, manure and Baraebong Organic Fertilizer the nitrate content in tomato yield increased compared to the control by 1.5-2 times, but it was significantly lower than MCL (150 mg/kg), which allows to consider the products environmentally friendly. The isolated bioorganic fertilisers are recommended for use in tomato cultivation to obtain high yields of ecologically clean tomato products.