OPTIMAL SEEDING RATES AND FORMATION OF PRODUCTIVE STEM DENSITY OF RICE CULTIVAR ‘KUBOYAR’

• Main Authors: P. I. Kostylev, N. V. Repkina
• Format: Article
• Language: Russian
• Published: Federal State Budgetary Scientific Institution “Agricultural Research Center “Donskoy”" 2018-05-01
• Series: Зерновое хозяйство России
• Subjects: rice; productivity; seeding rates; predecessor
• Online Access: https://www.zhros.ru/jour/article/view/251

The results of agrotechnical experiments to determine optimal seeding rate of rice cultivar ‘Kuboyar’ after such predecessors as perennial fallow, ameliorative field and rice after ameliorative field. The scheme of the experiments tended to study five variants: 5,0; 6,5; 8,0; 9,5 and 11,0 ml sprouts per one hectare. The rice was sown with seeding machine SSNP-16. The experimental plots were of 50 m2, three consecutive times. The experiments were carried out at the field of FSEF “Proletarskoe” according to the methods of field experiments. It was established that optimal seeding rate after all predecessors was 9,5 ml of sprouts per one hectare or 280-290 kg/ha. A smaller seeding rate doesn’t give any opportunity to realize the potential of the cultivar because of insufficient plant density, and excessive one increases lodging and plant infection, worsens grain quality and reduces productivity. At this rate rice gave the highest yield 8,96 t/ha (sainfoil), 7,75 t/ha (ameliorative field), 6,12 t/ha (perennial fallow) and 4,85 t/ha (rice) during four years of experiments. The structural analysis revealed that density of productive stems gives the highest yield of rice variety ‘Kuboyar’.To receive the productivity of 8,0 and more tons per one hectare it’s necessary to form an optimal stem density with 280-300 panicles per 1 m2. Thus, we can increase rice productivity and improve methods of its growing due to optimization of seeding rate.