Ìåòà. Âèçíà÷èòè îïòèìàëüí³ ñòðîêè ³ ñïîñîáè âíåñåííÿ ì³íåðàëüíèõ äîáðèâ äëÿ çá³ëüøåííÿ âðîaeàéíîñò³ ñî¿ ó ï³âäåííî-ñõ³äíîìó Ñòåïó Óêðà¿íè. Ìåòîäè. Ïîëüîâèé, ëàáîðàòîðíèé, âèì³ðþâàëüíèé, ðîçðàõóíêîâî-ïîð³âíÿëüíèé, ìàòåìàòè÷íî¿ ñòàòèñòèêè. Äîñë³äaeåííÿ ïðîâîäèëè ó 2016-2018 ðð. â ÄÏ «Äà «Çàáîéùèê» Äîíåöüêî¿ äåðaeàâíî¿ ñ³ëüñüêîãîñïîäàðñüêî¿ äîñë³äíî¿ ñòàíö³¿ ÍÀÀÍ». Ïîëüîâ³ äîñë³äè çàêëàäàëè ó òðèêðàòíîìó ïîâòîðåíí³ ç ñèñòåìàòè÷íèì ðîçì³ùåííÿì âàð³àíò³â. Ó äîñë³äàõ âèêîðèñòîâóâàëè òàê³ äîáðèâà: îñíîâíå (ôîí) -òóêîñóì³ø (àì³à÷íà ñåë³òðà N -34 %, ñóïåðôîñôàò ïðîñòèé ãðàíóëüîâàíèé Ð 2 Î 5 -19,5 %, êàë³é õëîðèñòèé Ê 2 Î -60 %); í³òðîàìîôîñêà ç óì³ñòîì N 16 %, Ð 2 Î 5 16 %, Ê 2 Î 16 %. Àãðîòåõí³êà çàãàëüíîïðèéíÿòà äëÿ çîíè Ñòåïó. Ìàòå-ìàòè÷íó îáðîáêó ðåçóëüòàò³â äîñë³äaeåíü ïðîâîäèëè çà Á. Î. Äîñïºõîâèì. Ïîãîäí³ óìîâè ðîê³â äîñë³äaeåíü áóëè òèïîâèìè äëÿ ï³âäåííî-ñõ³äíîãî Ñòåïó Óêðà¿íè. Ðåçóëüòàòè. Îäåðaeàí³ äàí³ âêàçóþòü íà åêîíîì³÷íó äîö³ëüí³ñòü âíåñåííÿ äîáðèâ íà ïî÷àòêó àêòèâíîãî ðîñòó êîðåíåâî¿ ñèñòåìè. ϳçí³ ïðèêîðåíåâ³ ï³äaeèâëåííÿ â óìîâàõ ï³âäåííîãî Ñòåïó º ìàëîåôåêòèâíèìè âíàñë³äîê íåãàòèâíî¿ ä³¿ âèñîêèõ òåìïåðàòóð, ïîñóõ, ñóõîâ³-¿â òà íåñòà÷³ âîëîãè. Íàéá³ëüøèé ïðèð³ñò óðîaeàéíîñò³ (0,47 ò/ãà, àáî 28,0 %) îòðèìàíî íà âàð³àíò³ ôîí + ïðèïîñ³âíå âíåñåííÿ N 20 P 20 Ê 20 . Êîìá³íóâàííÿ îñíîâíîãî âíåñåííÿ äîáðèâ òà êîðåíåâîãî ï³äaeèâëåííÿ N 20 P 20 Ê 20 ïðè ïåðøîìó ì³aeðÿäíîìó îáðîá³òêó ïîñ³â³â ñî¿ ó ôàç³ «äðóãèé òð³é÷àñòèé ëèñòîê» ï³äâèùóº âðîaeàéí³ñòü íà 0,41 ò/ãà, àáî 24,5 %. Çàñòîñóâàííÿ äîáðèâ N 20 P 20 Ê 20 îäíî÷àñíî ³ç ñ³âáîþ òà ïðè ïåðøîìó ì³aeðÿäíîìó îáðîá³òêó çá³ëüøóº ðåíòàáåëüí³ñòü â³äïîâ³äíî íà 15,7 òà 8,0 %. Ó òåõíîëî㳿 âèðîùóâàííÿ ñî¿ ó Ñòåïîâ³é çîí³ âíåñåííÿ äîáðèâ ïåðåä ñ³âáîþ òà ï³äaeèâëåííÿ ïåðåä çìèêàííÿì ì³aeðÿäü áóëè åêîíîì³÷íî íåäîö³ëüíèìè. Âèñíîâêè.  óìîâàõ ï³âäåííî-ñõ³äíîãî Ñòåïó Óêðà¿íè ïðàâèëüíî ï³ä³áðàíà ñèñòåìà çàñòîñóâàííÿ äîáðèâ äຠìîaeëèâ³ñòü ï³äâèùèòè âðîaeàé-í³ñòü (íà 20-30 %) òà ðåíòàáåëüí³ñòü âèðîùóâàííÿ ñî¿ (íà 8-16 %). Êëþ÷îâ³ ñëîâà: ñîÿ, ì³íåðàëüí³ äîáðèâà, ñïîñîáè ³ ñòðîêè âíåñåííÿ äîáðèâ, óðîaeàéí³ñòü, ðåíòàáåëüí³ñòü Ìèðîí³âñüêèé â³ñíèê Âèïóñê 8, 2019 Agroecology and plant growing Ìèðîí³âñüêèé â³ñíèê Âèïóñê 8, 2019 Agroecology and plant growing in the Steppe zone, fertilization before sowing as well as before inter row-space covering is uneconomical. Conclusions. Under conditions of the South-Eastern Steppe of Ukraine properly chosen fertilizer application system allows increasing soybeans yield (by 20-30 % and profitability (by 8-16 %) under conditions of the South-Eastern Steppe of Ukraine.