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Ultima descărcare din IBN: 2024-01-23 19:29 |
Căutarea după subiecte similare conform CZU |
633.15:631.53.04 (1) |
Cereale. Recolte de grâne (678) |
Lucrări agricole (1225) |
SM ISO690:2012 ŞTIRBU, Valentin, PARTAS, Eugenia, SPÎNU, Alexei. Răsărirea plantulelor de porumb in semănatul timpuriu. In: Ştiinţa Agricolă, 2016, nr. 2, pp. 8-16. ISSN 1857-0003. |
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Ştiinţa Agricolă | ||||||
Numărul 2 / 2016 / ISSN 1857-0003 /ISSNe 2587-3202 | ||||||
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CZU: 633.15:631.53.04 | ||||||
Pag. 8-16 | ||||||
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Rezumat | ||||||
The experiments were performed in 2013-2015 on 11 commercial maize hybrids of mediumand semilate maturity, planted on the 1st, 8th, 15th and 22nd of April which is by 4, 3, 2 and 1 week earlier than the optimum sowing date recommended for the central zone of the Republic of Moldova –April 29 (control variant). The study also included a variant which was sown at a late date (May 6). The hybrids sown on earlier dates exhibited a lower seedling emergence rate (on average over the all testing years) than the control: 8-11% less in the variants sown in the first two weeks of April and 5% less in the variants sown in the third or fourth week of April). The natural background during the germination and emergence period allowed to sort the hybrids, only in some cases, by their tolerance to sub-optimal temperatures. The hybrids PR37F73, POR 461, POR 310 and POR 427 in some variants with early sowing date recorded an emergence rate close or equal to the control variant, which means that these hybrids have shown a higher degree of tolerance to low temperatures during the period of germ development. In a statistical complex of three factors the influence of planting dates, hybrid and testing year on the variability of the number of emerged seedlings were analyzed. Out of these factors, the genotype and testing year were more important than the planting dates. The period between seed sowing and seedling emergence (ranging from 24 to 28 days in the variant sown in April 1 and from 8 to 13 days in the control variant and in the variant sown in May 6) is closely correlated with the number of days with sub-optimal night temperatures, the first days after sowing being critical for plantlet development. |
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Cuvinte-cheie Zea mays, porumb, hibrizi, Epoca de semănat, Semănat timpuriu, Răsărirea plantulelor |
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