Effect of Basic Fertilization and Split Application with Difererent Nitrogen Fertilizers Upon Yield and Quality of Prima Riska - Recently Developed Rice Variety

Abstract

During the two-year fi eld trials by the “Cade” method on alluvial soil type precrop rice, the effect of basic fertilization and split application with different nitrogen fertilizers upon yield and quality of prima riska – resently developed rice variety, recognized (approved) and registered in 2004 year was investigated. The variants in the experiments were the following:1. Control (unfertilized); 2. N75P75K75 - basic fertilizer; 3. N120P75K75 - basic fertilizer; 4. N75+45P75K75 - basic fertilizer + split application with Urea 46% N, 5.N75+45P75K75 - basic fertilizer + split application with KAN 27 % N; 6. N75+45P75K75 - basic fertilizer + split application with ammonium nitrate (NH4NO3) 34% N; 7. N75P75K75 - basic fertilizer + foliar split application with KRISTALON TM special 18+18+18+3MgO + mikroelements with 5kg/ha; 8.N75P75K75 - Basic fertilizer + foliar split application with KRISTALON TM special 2,5+2,5 kg/ ha. The complex fertilizer NPK (15+15+15) in rate of 500 kg/ha is applied as a basic fertilizer before rice seeding and split-application is applied during the time of vegetation. According to the obtained results, important increase in the yield of grain and straw in the fertilized variants has been detected compared with the control. The highest average yield of grain is achieved in the variant 3 (paddy rice – 8 866 kg/ha, white rice – 5 543 kg/ha), and straw in the variant 5 (17 155 kg/ha). The best average white rice yield (whole grains) is achieved in the variant 6 (63,64%). In the control the following yield was achieved: paddy rice – 5 805 kg/ha, white rice – 3 568 kg/ha, straw – 12 250 kg/ha and white rice yield – 61,52%.