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2018, N 2 (32) |
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PLANT GROWING
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Onishcenko L., Lukyanova E. |
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Evaluation of the contribution of alfalfa to nitrogen of chernozem leached Prikubanskaya lowland |
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The results of studies on the establishment of the contribution of biological nitrogen to alfalfa in the nitrogen reserve of chernozem leached Prikubanskaya lowland in the study of the aftereffect of prolonged use of mineral fertilizers in the conditions of stationary experiment on crops of alfalfa of the first year of life, grown under the cover of spring barley in 11-grain grain-tilled crop rotation. The total amount of total and biological nitrogen, taking into account the nitrogen fixation coefficient in the green mass of alfalfa and its plant residues on the control, is 88 kg / ha. The aftereffect of species and differentiated norms of mineral fertilizers on this indicator was different. When nitrogen, phosphorus and potassium fertilizers were introduced, the content of total and biological nitrogen was: N60 - 111; P60 - 104; K40 - 99 kg / ha, as well as at low, medium and high standards: N30R30K20 - 124; N60R60K40 - 137; N90R90K60 - 143 kg / ha. The total accumulation of biological nitrogen in the above-ground biomass of alfalfa relative to the control varied in the direction of increase, depending on the types of fertilizers by 20.5; 11.8 and 5.9%, and from the norms - by 32.4%, 50.0 and 52.9%, respectively.
Keywords: SOIL, NITROGEN BIOLOGICAL, PHOSPHORUS, POTASSIUM, URO-ZHAY, FERTILIZERS, EXPERIENCE, LYUTSERNA |