Âñòàíîâèòè îïòèìàëüí³ ñòðîêè ñ³âáè òà ãëèáèíó çàãîðòàííÿ íàñ³ííÿ ñîðãî çåðíîâîãî ñîðò³â 'Äí³ïðîâñüêèé 39' òà '³íåöü', îá´ðóíòóâàòè ¿õí³é âïëèâ íà ôîòîñèíòåòè÷íó ïðîäóêòèâí³ñòü ïîñ³â³â â óìîâàõ Ïðàâîáåðåaeíîãî ˳ñîñòåïó Óêðà¿íè. Ìåòîäè. Ïîëüîâèé, ëàáîðàòîðíèé, ïîð³âíÿëüíèé, àíàë³òè÷íèé, óçàãàëüíþþ÷èé, ìàòåìàòè÷íî-ñòàòèñòè÷íèé. Ðåçóëüòàòè. Íàéêðàù³ ðåçóëüòàòè ôîòîñèíòåòè÷íî¿ ïðîäóêòèâíîñò³ ïîñ³â³â ñîðãî çåðíîâîãî îòðèìàíî çà ñ³âáè ó ² äåêàä³ òðàâíÿ (äðóãèé ñòðîê) íà ãëèáèíó çàãîðòàííÿ íàñ³ííÿ 4-6 ñì. ³äïîâ³äíî, ïëîùà ëèñòêîâî¿ ïîâåðõí³ çà öèõ ôàêòîð³â ó ïåð³îä «âèêèäàííÿ âîëîò³-öâ³ò³ííÿ» ñÿãàëà ìàêñèìóìó ³ äîð³âíþâàëà 36,13-38,81 òèñ. ì 2 /ãà ó ñîðòó 'Äí³ïðîâñüêèé 39' òà 34,23-36,91 òèñ. ì 2 /ãà ó ñîðòó '³íåöü'. Çà ñ³âáè íàñ³ííÿ ó ²²² äåêàä³ êâ³òíÿ (ïåðøèé ñòðîê) çà òàêèõ ñàìèõ çíà÷åíü ãëèáèíè çàãîðòàííÿ ïëîùà ëèñòêîâî¿ ïîâåðõí³ ó ñîðò³â áóëà äåùî ìåíøîþ ³ ñòàíîâèëà 29,56-31,20 òèñ. ì 2 /ãà ó ñîðòó 'Äí³ïðîâñüêèé 39' òà 27,76-29,40 òèñ. ì 2 /ãà ó ñîðòó '³íåöü'. Çà ñ³âáè íàñ³ííÿ ó ²² äåêàä³ òðàâíÿ (òðåò³é ñòðîê) ïëîùà ëèñòêîâî¿ ïîâåðõí³ äîð³âíþâàëà 30,68-32,92 òèñ. ì 2 /ãà ó ñîðòó 'Äí³ïðîâñüêèé 39' òà 29,08-31,32 òèñ. ì 2 /ãà ó ñîðòó '³íåöü'. Ôîòîñèíòåòè÷íèé ïîòåíö³àë áóâ íàéâèùèì ó ðîñëèí ñîðãî çåðíîâîãî çà ²² ñòðîêó ñ³âáè íàñ³ííÿ òà ãëèáèíè çàãîðòàííÿ 4-6 ñì é äîð³âíþâàâ 1,27 òà 1,34 ìëí ì 2 /ãà ó ñîðòó 'Äí³ïðîâñüêèé 39' ³ 1,16 òà 1,22 ìëí ì 2 /ãà ó ñîðòó '³íåöü'. Çà ² ñòðîêó ñ³âáè öåé ïîêàçíèê áóâ äåùî ìåíøèì ³ â³äïîâ³äíî ñòàíîâèâ 1,18 òà 1,23 ìëí ì 2 /ãà ó ñîðòó 'Äí³ïðîâñüêèé 39' é 0,98 ³ 1,02 ìëí ì 2 /ãà ó ñîðòó '³íåöü'. Çà ²²² ñòðîêó ñ³âáè â³í áóâ íàéìåíøèì òà ó ñîðòó 'Äí³ïðîâñüêèé 39' äîð³âíþâàâ 1,09 ³ 1,13 ìëí ì 2 /ãà, ó ñîðòó '³íåöü' 0,88 ³ 0,93 ìëí ì 2 /ãà çà îïòèìàëüíèõ çíà-÷åíü ãëèáèíè çàãîðòàííÿ íàñ³ííÿ. Çà ãëèáèíè çàãîðòàííÿ íàñ³ííÿ 2 òà 8 ñì ôîòîñèíòåòè÷íèé ïîòåíö³àë áóâ íèae÷èì, ùî ïîÿñíþþòü ð³çíèìè ´ðóíòîâî-êë³ìàòè÷íèìè óìîâàìè ó ïåâíèé ïåð³îä ðîçâèòêó ðîñëèí ñîðãî. Íàéá³ëüøå çíà÷åííÿ ïîêàçíèêà ÷èñòî¿ ïðîäóêòèâíîñò³ ôîòîñèíòåçó áóëî îòðèìàíî çà ñ³âáè íàñ³ííÿ â îïòèìàëüí³ ñòðîêè òà çà îïòèìàëüíî¿ ãëèáèíè çàãîðòàííÿ íàñ³ííÿ ³ ñòàíîâèëî ó ñîðòó 'Äí³ïðîâñüêèé 39', â³äïîâ³äíî, 3,84-4,02 ã/ì 2 çà äîáó, ó ñîðòó '³íåöü' 3,79-3,98 ã/ì 2 çà äîáó. Âèñíîâêè. Íàéêðàùå ðîçâèâàëèñü òà ôîðìóâàëè ôîòîñèíòåòè÷íó ïðîäóêòèâí³ñòü ðîñëèíè ñîðãî çåðíîâîãî çà ñ³âáè íàñ³ííÿ ó ïåðø³é äåêàä³ òðàâíÿ íà ãëèáèíó çàãîðòàííÿ 4-6 ñì, ÿê³ é ðåêîìåíäîâàíî äëÿ âèðîùóâàííÿ äàíî¿ êóëüòóðè â Ïðàâîáåðåaeíîìó ˳ñîñòåïó Óêðà¿íè. Êëþ÷îâ³ ñëîâà: ïðîäóêòèâí³ñòü ôîòîñèíòåçó; ôàçè ðîñòó; ïëîùà ëèñòêîâî¿ ïîâåðõí³.
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