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STABILITY OF POPCORN CULTIVARS TO DIFFERENT ENVIRONMENTS IN THE STATE OF MINAS GERAIS

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Author(s): RENZO GARCIA VON PINHO | ANDRÉ BRUGNERA | CLESO ANTONIO PATTO PACHECO | MAXIMILIAN DE SOUZA GOMES

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 2;
Issue: 1;
Start page: 53;
Date: 2002;
Original page

Keywords: Zea mays: cultivars | popcorn: genotype x environment interaction

ABSTRACT
The performance of popcorn cultivars varies from one environment to another. Therefore, one cultivar alone can hardly ever be considered the best for all tilling conditions. The different response of cultivars in relation to the environment is known as genotype x environment interaction. The purpose of this work was to estimate the adaptability and stability of popcorn cultivars as they underwent stimulated environment seed sowing fertilizing rates at different sites and harvesting years in the estate of Minas Gerais, southeastern Brazil. Eight popcorn cultivars were evaluated at two seed sowing fertilizing rates in the cities of Lavras, Ijaci and Sete Lagoas, during the harvesting years of 2000/01 and 2001/02 covering 12 different environments. Each site had two distinct experiments, the first one consisted of applying 250 kg.ha-1 of 8 (N): 28 (P2O5): 16 (K2O) during seed sowing and the second one received 500 kg.ha-1 of the same fertilizing rate formula. Top dressing was similar for both experiments. A randomized block design with four repetitions was used in both cases. Each experiment was considered as a different environment as they were carried out at different locations, fertilizing rate and harvesting years. The experiments were submitted to an assembled variance analyses, where grain weight (Kg.ha-1) and expansion capacity (ml.g-1) were taken into account. The parameters which evaluated the adaptability and stability were estimated by the Eberhart and Russell (1996) and Annicchiarico (1992) methods. The popcorn cultivars, differed in grain weight, but not in expansion capacity. Zélia, IAC-112 and Ames-4198 cultivars presented the best grain production and CE results, namely 2710, 2728 and 2696 kg.ha-1; 28.6, 27.6 and 27.5 ml.g-1, respectively. These results were found at both favorable and unfavorable conditions, showing that these cultivars are highly indicated for the regions where they were tested.
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