Combined fertilization with N and K of and irrigated grape-vine pergola, Cv. Moscatel Rosada (Pink Muscat), at Cauquenes

Arturo Lavín A.1

From 1975to 1981 a trial was conducted at the Cauquenes ExperimentStation (INIA), to evaluate the effects of two levels of N (56 and 112 u./ha) and three of K (94, 188 and 376 u./ha) on a recently planted (1975) Moscatel Rosada pergola, under irrigation. Growth, yield and nutrient levels in petioles were measured. The first year (1975/76) N applications were reduced to 1/3, and the second year (1976/77) to 2/3 to the annual amount stablished for the rest of the experiment, but a depressive etfect on growth was detected. Through the entire period, K levels did not affect growth, and neither N or K affected yleld. Petiole analysis showed high levels of total N (over 0.90%), even for samplings at harvest time. P leveis were normal for fuil bloom but high in the harvest samplings, as compared with former measurements in the same zone. For K, the levels were normal to high, specially at harvest time. For four of the eight samplings made, a significant correlation was found between K doses and K percentages in petioles. It was concluded that the fertilizer doses applied, when including irrigation, were higher than necessary for good growth, yield and nutrition of vines, growing in the solls of this typically dryland vineyard zone.

1 Subestación Experimental Cauquenes (INIA), Casilla 165, Cauquenes, Maule, Chile.