TY - JOUR AU - Gómez, Luis A. AU - Vadez, Vincent AU - Hernández, Germán AU - Sánchez, Támara AU - Toscano, Vidalina PY - 2006/01/01 Y2 - 2024/03/29 TI - Evaluation of tolerance to phosphorus shortage in cowpea (Vigna unguiculata L. Walp) in Cuba.. I. nutritive solution culture. JF - Agronomía Mesoamericana JA - Agron. Mesoam. VL - 13 IS - 1 SE - Technical Notes DO - 10.15517/am.v13i1.13453 UR - https://revistas.ucr.ac.cr/index.php/agromeso/article/view/13453 SP - 59-65 AB - Phosphorus deficiency is a major limiting<br />factor for symbiotic nitrogen fixation and grain yield of<br />legume crops in the tropics. Eight cowpea genotypes of wide<br />use in Cuba, were grown in hydroponics solutions; supplying<br />from 50 to 500 µM of P/plant/week. Nitrogen nutrition was<br />dependent upon symbiotic N2-fixation on adding of 4<br />mmoles NO3/plant/week. Shoot growth was severely limited<br />by P deficiency, while dry weight of roots increased in both<br />groups of plants. Nodule formation was severely decreased<br />by P deficiency, while specific nodule activity was increased<br />in the atmospheric N2 fixing plants. Growth response of N2<br />plants was higher than that of NO3- fed plants due to P use<br />efficiency, and revealed a the great large N2-fixation<br />potential of the specie. ER -