THE RESPONSE OF RICE VARIETIES ON THE LEVEL OF MINERAL NUTRITION AND THE SEEDING RATE
2018
M. A. Ladatko
In the conditions of the trial we studied the effect of nitrogen nutrition and seeding rate on the formation of density of plant stand and productivity of new rice varieties. It has been determined that according to the varieties and nutrient status the increase of the seeding rate from 5 to 7 ml of germinating kernels per hectare results in the improvement of density of plant stand on 39.7%. The further increase of the seeding rate from 7 to 9 ml of germinating kernels per hectare results in the improvement of density of plant stand only on 22.7%. With the increase of the seeding rate the varieties ‘Patriot’ and ‘Istok’ produced the largest increase of the density of plant stand on the average (N92 P50 ) and higher (N138 P50 ) nutrient statuses, the variety ‘Istok’ gave the largest increase on the highest status (N174 P50 ). With this regard, the varieties ‘Kazachok-4’, ‘Orion’ and ‘Patriot’ possess the better rates of growth. The increase of nitrogen dose from 92 to 138 kg/ha gave a maximum increase of productivity to the variety ‘Natasha’ (on 17.3%) and the increase of nitrogen dose from 138 to 174 kg/ha gave a maximum increase of productivity to the variety ‘Dozhdik’ (on 15.1%), while the productivity increase of the varieties on average was 4.2 and 10.0% respectively. The varieties ‘Dozhdik’, ‘Orion’ and ‘Patriot’ have been found responsive to the increase of seeding rate; the varieties ‘Natasha’, ‘Dozhdik’, ‘Orion’ and ‘Kazachok-4’ have been found responsive to a high level of nitrogen nutrition. The varieties ‘Istok’ and ‘Partner’ produce the largest yields on the average nutrient status, the variety ‘Orion’ gives the best productivity on the higher and high statuses.
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