Effect of the date of polypropylene textile removal and sites on yield-forming components of early potatoes

air temperature caracteres de rendimiento composante de rendement crop yield cultivo protegido culture sous abri facteur de rendement factores de rendimiento field experimentation papa peso poids polipropileno polypropylene pomme de terre potatoes precipitation protected cultivation protective structures rendement des cultures rendimiento de cultivos soil temperature solanum tuberosum stems structure de protection tallos temperatura del aire temperatura del suelo textile textiles tige tubercule tubers weight yield components yield factors