Agricultural Academy

Abstract POPOV, N., A. DZIMOTUDIS, S. KRASTEV and S. KALAPCHIEVA, 2010. The effect of RENI products on enzymatic activity of nitrogen metabolism in garden peas. Bulg. J. Agric. Sci., The aim of the present study was to establish the effect of two products of regulating effect (RENI and RENI A) on the activity of some major enzymes of nitrogen metabolism in garden peas at the stages of active nitrogen fixation. The investigations were carried out with garden pea plants of Vyatovo cultivar, grown in soil pot experiments (each plastic bucket of 5 l volume containing 3 kg of air dry soil). The experimental variants were: 1. Control -untreated, 2. Treated with RENI, 3. Treated with RENI À. Treatment was applied only once at the stage of buttoning and the first analyses were made 7 days after treatment. Treatment of garden peas with RENI products increased the activity of the enzymes nitrogenase, glutamine synthetase and asparagine synthetase in the plant roots. The highest activities were reported at the stage of mass flowering, which is a precondition for extending the process of symbiotic nitrogen fixation. The reported values ranged within 3.14 -11.75 μmol/h/plant for nitrogenase; 33 -90 μmol/h/g/ for glutamine synthetase; 28 -88 μmol/h/g/ for asparagine synthetase. A positive interaction was established between nitrogenase activity (directly related to biological nitrogen fixation) and glutamine synthetase and asparagine synthetase activities (directly related to the uptake of the reduced nitrogen) after treatment with the products RENI. Treatment with the products RENI and RENI A decreased nitrate reductase activity in the leaves at all the studied stages and in the roots -at the buttoning stage. The effect of the action of both substances was different -RENI reduced nitrate reductase activity to a greater degree and at the same time, it increased nitrogenase, glutamine synthetase and asparagine synthetase activities also to a greater degree

STUDY ON QUANTITATIVE CHARACTERS OF ORGANIC SEEDS IN GARDEN PEA

The experiment was conducted in the Maritsa Vegetable Crops Research Institute, Plovdiv during the period 2008-2009. Four garden pea varieties were grown in the conditions of organic and conventional production. The purpose of the experiment was to study the quantitative characters of seeds obtained in organic production. It was established that the organic garden pea seeds differ with lower absolute weight compared to the seeds obtained in conventional system but they kept high germination (89,5-96,5) close to the control variant. The late variety Vyatovo grown with organic fertilizers and biopesticides are with the lowest percentage of injuries by Bruchus pisi l

ИЗУЧЕНИЕ КОЛИЧЕСТВЕННЫХ ХАРАКТЕРИСТИК ОРГАНИЧЕСКИХ СЕМЯН ГОРОХА ОВОЩНОГО

The experiment was conducted in the Maritsa Vegetable Crops Research Institute, Plovdiv during the period 2008-2009. Four garden pea varieties were grown in the conditions of organic and conventional production. The purpose of the experiment was to study the quantitative characters of seeds obtained in organic production. It was established that the organic garden pea seeds differ with lower absolute weight compared to the seeds obtained in conventional system but they kept high germination (89,5-96,5) close to the control variant. The late variety Vyatovo grown with organic fertilizers and biopesticides are with the lowest percentage of injuries by Bruchus pisi l.Эксперимент проведен в Институте овощных культур (Марица, Пловдив, Болгария) в 2008-2009 годах. Четыре сорта гороха овощного выращивали в условиях органического и конвенционного производства. Цель исследования – изучение количественных характеристик семян, полученных в органических условиях. Установлено, что органические семена гороха овощного отличаются более низкой абсолютной массой в сравнении с конвенционной системой, но сохраняют высокую всхожесть (89,5-96,50), близкую к контрольному варианту. Поздний сорт Вятово, выращенный с использованием органических удобрений и биопестицидов, имеет наиболее низкий процент поражения Bruchus pisi L