Abstract
In a long-term stationary field experiment that was established in 1971 on leached chernozem underlain by pebbles under conditions of field crop rotation the effect of systematic application of fertilizers for hybrid corn on plant growth processes was studied. It was found that the fertilized variants increased relative to the control: the growth of plants in height, the increase in leaf surface area, the accumulation of raw and dry biomass, increased photosynthetic potential. From the fertilized options, the calculated option N310P324K139 stood out for the better for the planned yield of 8.0 t/ha. In this variant at the end of the growing season the average height of the plant was 256 cm versus 247 cm in the control; the leaf surface area was 60056 versus 49392 m2/ha in the control; the photosynthetic potential was 3.08 million m2/ha.day versus 2.53 at the control; the amount of dry biomass is 22.5 versus 15.0 t/ha at the control. According to all indicators the double dose of N140P80K180 was in second place: respectively accordingly 255 cm, 56,808 m2/ha, 2.87 million m2/ha.day, 20.4 t/ha. Of the equivalent options a double dose of NPK had some advantage over manure+NPK (trend).
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