Influence of the distribution of the fertilizer norm of nitrate nitrogen and irrigation regime on the yield and some morphological and biochemical parameters in peanuts variety Tsvetelina

Abstract

During the period 2019-2020 at the Institute of Plant Genetic Resources - Sadovo, Bulgaria a comparative study was conducted on the influence of nitrate nitrogen and irrigation regime on the productive potential of peanuts of the Valencia type, variety Tsvetelina. This study aims to determine whether the distribution of nitrate nitrogen and water regime are interrelated factors in peanuts. The study showed that the fertilization whit nitrate nitrogen are effective up to the budding phase. Its deficiency before the onset of this phenophase leads to a decrease in yield and cannot be compensated by its later fertilization. The optimal water content in the soil contributes to better nitrogen absorption. Nitrogen and water lead to higher chlorophyll content in peanut leaves and efficiency of photosynthesis. The supply of nitrate nitrogen in the initial stages of peanut development, the content of chlorophyll in the leaves and the optimal water content of the soil lead to increased yield. Deficiency of nitrogen and water disrupts the synthesis of chlorophyll and leads to lower yields. The regularly irrigated variant with pre-sowing application of the whole nitrate norm is distinguished by the highest productive possibilities.