PRELIMINARY RESULTS REGARDING THE BIOLOGICAL POTENTIAL OF SOME COWPEA GENOTYPES STUDIED IN DIFFERENT CROPPING SYSTEMS UNDER CLIMATE CHANGE CONDITIONS IN SOUTHERN OLTENIA
DOI:
https://doi.org/10.1199/sqy8g077Keywords:
Vigna unguiculata, phenology, thermal resources, leaf index, grain productionAbstract
The research focused on the behavior of four varieties of cowpea (Vigna unguiculata L. Walpers), genotypes cultivated in different cropping systems under the conditions of the sandy soils in the south of Oltenia. The results showed that for the formation of pods (>85% mature green pods), the tested cowpea varieties needed a temperature of 937,1-1161.92 0C in the main crop, of 1115.4-1172.2 0C in successive crop after early potato and of 1118.1-1233.5 0C in successive crop after rye. The vegetation period for the cowpea to reach the physiological maturity of the pods (>85% pods with ripened grains), was differentiated according to the variety and the culture system, being between 81-88 days, in the main culture system, when accumulated in the air 1509.8-1931.4 0C and 93-100 days in the successive crop system after the early potato, when they accumulated in the air 2171.7-2269.4 0C. The statistical analysis of the grain production recorded in the four cowpea varieties shows that by sowing in the main crop they did not significantly differences from the average, instead in the successive crop after the early potato, the genotypes Aura 26 and Doljana differed distinctly significantly and significantly relative to their mean. By sowing in the successional crop after rye, (end of July), none of the cowpea varieties tested reached the physiological maturity of the pods to obtain grain yield.References
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