EFFICIENCY OF FERTILIZERS APPLICATION FOR SOYBEAN ON LEACHED CHERNOZEM IN THE REPUBLIC OF NORTH OSSETIA-ALANIA
Three years research on leached chernozem in forest-steppe zone of North Ossetia-Alania showed positive influence of fertilizers on the yielding capacity and quality of soybean. Increasing the level of fertilizer from N30P30K30 to N90P90K90 raised grain yield increase from 0,28 to 0,52 t/ha; on the manure 20 t/ha and its combination with a single dose NPK obtained increase 0,62-0,76 t/ha. Application of top dressing with aqueous solutions of trace elements on the background of a single dose of NPK increased yields by 0,47-0,34 t/ha, and on the background of a double dose of NPK - by 0,75-0,63 t/ha. Fertilizers application has been beneficial not only from the agronomic point of view, but both economic and energetic. With increasing the level of fertilizers from single to triple doses of NPK net income decreased from 1,5 to 0,48 thousand rubles but the recoupment of 1 kg active ingredient (AD) with grain - from 3,1 to 1,9 kg. On the manure and its combination with N30P30K30 net income was in average for 3 years 1,21 - 0,95 thousand rubles but the recoupment of fertilizers - 5,2-3,6 kg of grain/kg of active ingredient (AD). Application of top foliage spraying on the background of a single dose of NPK produces net income from 1,27 to 0,89 thousand rubles/ha but on the background of a double dose of NPK - from 0,98 to 0,79 thousand rubles/ha. On both backgrounds molybdenum was advantageous, the second place occupied cobalt, and the third - zinc. Energetic efficiency of fertilizers application for soybean varied in the same way: from the single dose of NPK to the triple the energetic efficiency decreased from 3,3 to 2,0 units. Due to the low energy costs for manure energetic efficiency rises steeply (to 99), but when combined with the single dose of NPK it decreased to 8,3 remaining highly effective. On options with foliar feed with micronutrients energetic efficiency is at a high level - from 5,4 - 4,4 for molybdenum, to 5,1 - 4,2 for cobalt, 4,0 - 3,7 for zinc. Positive energetic efficiency is marked for natural agroores - irlits. When a separate their application the energetic efficiency was for irlit 1 - 54,3-133,5 depending on the dose (200 and 800 kg/ha) at irlit 7 - 30,2-139,5. In combination with NPK it for both doses of both irlits dips down, making up for irlit 1 - 2,5-4,8 and for irlit 7 - 1,7-2,6 units.