Fertility of sod-podzolic soils and productivity of perennial grasses in long-term use of mineral fertilizers at the background of liming
doi: 10.30766/2072-9081.2017.60.5.28-33.
Pages: 28-33.
read allBulatova N.V., researcher,
Regorchuk N.V., head of laboratory
Research Institute of Agriculture of the Komi Republic, Syktyvkar, Republic of Komi, Russia
E-mail: bulatova-n18@yandex.ru
The effect of application of mineral fertilizers at the background of long-term (20 years) aftereffect of liming on agrochemical properties of sod-podzolic middle-loamy soil and yield of the clover-timothy mixture was studied in the field stationary experiment. It was established that at single application of dolomite powder in a dose of 1 unit of hydrolytic acidity (h.a.) the soil acidity is supported on level of medium acidity – рНKCl 4.6…4.7, in a dose of 2 h.a. – on level from slightly acidic upto next to neutral – рНKCl 5.5…5.6. Growing up of perennial grasses for 5 years contributed to the preservation of humus content in the soil at the level of 1.56 to 1.74% at the initial 1.5%. The degree of soil saturation with bases (V) at the background of lime aftereffect in dose of 1 h.a. made up 69…74%, which indicates a weak need of soil in the re-liming. At the background of aftereffect of lime input in a dose of 2 h.a. it is not required ameriorant inputting (V = 81…83%). Annual application of mineral fertilizers contributed to the accumulation of mobile phosphorus in the soil to high and very high level (173…281 mg/kg), and exchangeable potassium to the medium level (115…132 mg/kg). The degree of phosphorus mobility increased with increasing doses of mineral fertilizers, the maximum values (0.30…0.35 mg/l) were obtained on limed backgrounds. The aftereffect of lime had no effect on potassium mobility, which one was determined by the dose of fertilizers applied – 5.7…6.6 mg/l (N30P45K45), 9.0…13.9 mg/l (N60P75K75). Plants better used nutritions from fertilizer when they are inputted at the background of lime aftereffect: phosphorus – up to 27…34%, potassium – up to 76…96%. Utilization of phosphorus from soil was 25…34%, potassium – 32…40%. Inputting of N60P75K75 at the background of dolomite aftereffect at a dose of 2 h.a. provided the highest yield of dry mass of perennial grasses - 4.7 t/ha. When mineral fertilizers, independently on lime action the balance of phosphorus was positive, of potassium – negative. Intensity of balance was, respectively, 157…259% and 61…89%.
Keywords: dolomite powder, mineral fertilizer, sod-podzolic soil, phosphorus, potassium, balance, utilization factor, perennial grasses
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