Âñòóï ß÷ì³íü ÿðèé º îäí³ºþ ç îñíîâíèõ çåðíîôóðàaeíèõ êóëüòóð â Óêðà¿í³: çà ïîñ³âíèìè ïëîùàìè òà âàëîâèì çáîðîì â³í ïîñ³äຠäðóãå ì³ñöå ï³ñëÿ ïøåíèö³ îçèìî¿. Ïðîòå, çà âè-ñîêî¿ ïîòåíö³éíî¿ çåðíîâî¿ ïðîäóêòèâíîñò³ ñó÷àñíèõ ñîðò³â ÿ÷ìåíþ (ïðèáëèçíî 9,0 ò/ãà), éîãî âðîaeàéí³ñòü ó âèðîáíè÷èõ óìîâàõ çàëèøàºòüñÿ íèçüêîþ ³ íåñòàá³ëüíîþ ç³ çíà÷íèìè êîëèâàííÿìè çà ðîêàìè ï³ä âïëèâîì áàãàòüîõ ÷èííèê³â âèðîùóâàííÿ (äî 40% i á³ëüøå) [1]. Âàaeëèâó ðîëü ó ôîðìóâàíí³ ïðîäóêòèâ-íîñò³ ñ³ëüñüêîãîñïîäàðñüêèõ êóëüòóð â³ä³ãðຠçì³íà êë³ìàòè÷íèõ óìîâ [2]. Çîíà ϳâäåííîãî Ñòåïó Óêðà¿íè õàðàêòåðèçóºòüñÿ íå-ñò³éêèì ³ íåäîñòàòí³ì çâîëîaeåííÿì, âèñîêèìè ë³òí³ìè òåìïåðàòóðàìè, çàñîëåí³ñòþ ÷àñòèíè ´ðóíò³â. Òàêèé êîìïëåêñ àá³îòè÷íèõ ÷èííèê³â íåãàòèâíî âïëèâຠíà ð³ñò ³ ðîçâè

The researches results of top spring barley growth depending on varietal characteristics and nutrition are showed. Experimental studies were conducted during 2013-2017 yrs. on the experimental field of the Mykolaiv NAU. Studies have shown that the processes of accumulation of raw aboveground mass by plants of spring barley depended on the fertilizer variant and increased intensively from the phase of plant emergence into the tube before earing. In the Aeneas variety, in the earing phase, an increase in the studied indicator was observed compared to the previous phase of plant development by 726-923 g/m 2 or by 34.8-35.9 % depending on the way of nutrition. The accumulation of raw biomass by plants of the variety Aeneas, on average over the years of research, was greater than that of plants of other studied varieties. On average, over they ears of research, in the control of raw biomass of plants variety Aeneas in the phase of plants' yield in the plant stooling has accumulated 896 g/m 2 , the earing phase-1692 g/m 2 , and phase of full grainy grain-976 g/m 2 , which is 5,4-6,4; 0,9-1,7 and 1,1-2,2 % which is more compared to the raw mass of plants of the Stalker and Aeneas varieties. The same trend was observed in other variants of the experiment. The largest amount of raw top mass of Aeneas variety was in the variant of fertilization with N30P30 and the biological preparation Escort-bio-1543-2695 g/m 2 depending on the phase of growth and development of plants. The process of accumulation of dry mass in the planting phase was slow. However, al ready from the phase of the plants' we considered in the tube a significant difference depending on the nutrition of plants and the variety at 40.

The article is devoted to increasing the yield of winter wheat by means of fore-crop choosing and using stubble bio-destructor by improving the nutrient soil regime and activating its microbiological activity. The experimental studies were conducted during 2011−2016 on the experimental field of Mykolaiiv National Agrarian University. The object of the research was Kolchuha winter wheat variety. The technology of its cultivation, except for the studied factors, was generally accepted as to the existing zonal recommendations for the southern steppe of Ukraine. The scheme of the experiment included the following variants: A factorfore-crop: 1. spring barley; 2. pea. B factor -the treatment of crop residues: 1. water treatment as control; 2. treatment of stubble with bio-destructor (produced by the private enterprise "BTU-center", Ukraine). After harvesting the spring barley and pea fore-crops the post-harvest residues of these crops were treated with the stubble bio-destructor (produced by the private enterprise "BTU-center", Ukraine) at the dose of 2 liters of the bio-preparation and adding 3.0 kg of ammonium nitrate with the spray solution of 300 liters per 1 ha, after which the residues were disked by the heavy disk harrow BDT-7 to the depth of 10−12 cm. It should be noted that the gross content of basic nutrients in the plant residues depends significantly on the biological characteristics of crops and their yields. It was determined in our studies that on the average during the years of the research and according to the factor of treating post-harvest residues with the biodestructor, after spring barley the soil contained 11.2 mg/kg of nitrates, 52.2 mg/kg of mobile phosphorus and 238.5 mg/kg of exchangeable potassium, which is respectively by 13.8; 11.8 and 14.2 % less than in the soil while cultivating winter wheat after pea. The experiments, conducted by us, showed that the number of nitrogen fixing agents in the soil increased under the action of treating crop residues of spring barley and pea with the stubble bio-destructor. Thus, in the variants without using the bio-preparation in the 0−10 cm experimental soil layer there were from 24.9 · 10 6 up to 32.5 · 10 6 pcs of nitrogen-fixing bacteria per 1 g of the soil, and in the layer of 10−20 cm there were from 21.8 ·10 6 up to 30.7 ·10 6 pcs / 1 g soil, which was respectively by 13.4 · 10 6 −14.1 · 10 6 and 14.0 · 10 6 −14.2 · 10 6 pcs / 1 g soil less or about 30.3 up to 35.0 and 31.6-39.1 % less as compared with their number in the soil variants when using stubble bio-destructor. It should be noted that using pea as the fore-crop of winter wheat provides a slightly greater number of nitrogen fixing agents as compared with spring barley in the soil layer of 0-10 cm by 7.6 up to 8.3 ·10 6 pcs / 1 g of soil or from 17.8 up to 23.4 %, and in the layer of 10-20 cm, the number of nitrogen fixing agents increased from 8.9 up to 9.1 · 10 6 pcs / 1 g of soil or 20.3 up to 29.0 % depending on the treatment of crop residues. As a result of the studies it was establi...

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