Índices de extracción de NPK con dos frecuencias de fertilización edáfica en el cultivo de Girasol - Helianthus annuus en la parroquia de Cunchibamba.

Abstract

In Ecuador, sunflower is cultivated in few extensions, presenting as main problem the lack of hybrids of sunflower of high productivity reason why an adequate policy of promotion of this oleaginosa is of great necessity to diminish the importation of raw material and to take advantage of unproductive zones in The need to support projects in which national production is stimulated with the development of technical and economic research that will transform the productive sector, so as to substitute imports of this important seed. The following project aims to determine the NPK extraction rates to know the behavior of the crop in different phenological stages, in an altitudinal floor of 2710 msnm, with the use of three varieties of seeds such as, Argentina, USA and Nacional in different Frequencies of fertilization to obtain the best yield of the crop in the Hacienda "San Pablo" located in the parish Cunchibamba, Canton Ambato, province of Tungurahua. With bromatological analyzes in the extraction of NPK in leaves, stems, root and the seed of Girasol with their respective productive yield was determined that the variety that best adapted to the conditions of the place and obtained a greater yield was Argentina with the application of The fractional fertilization at 40 and 80 days yielding a yield of 1.9 t / ha.