Determination of agro-ecological affiliation of rice varieties in flooding conditions

Abstract

Selection of optimum rice varieties in different soil and climatic conditions is a prerequisite for the efficient use of natural resources to form highly productive crops.The aim and tasks of the study. The aim of our study was to determine the suitability of rice varieties for cultivation, depending on the climatic conditions of a region.Material and methods. The investigations were carried out at the experimental field of the Institute of Rice NAAS in 2011-2013 in compliance with the BA Dospekhov’s methodology of experimentationResults and discussion. The results of studying peculiarities of determination of agro-ecological affiliation of rice varieties in flooding conditions on different nutrition. Three types of agro-ecological affiliation of rice varieties were developed: northern, temperate and southern. If rice grain filling in rice varieties the most actively occurs in the phase of milk ripeness and virtually stops at the beginning of the phase of wax ripeness, these varieties can be referred to the northern type. If grain filling the most actively takes place in the phase of milk ripeness and the first half of the phase of wax ripeness and stops at the beginning of the second half of the phase of wax ripeness, these varieties can be referred to the temperate type. If grain filling is uniform during the phase of milk ripeness and until the end of the phase of wax ripeness, such varieties can be referred to the southern type.Conclusions. Variety ‘Debut’ belongs to the northern agro-ecological type; ‘Ontario’ – to the temperate type; and ‘Admiral’ - to the southern type.