Tecnología para la producción de semilla de líneas que forman híbridos tropicales de maíz

Abstract

An experiment was established with the aim of knowing the response to the D N-P-K effect (D = population density) in six maize lines during the spring-summer cycle 1995, in CECOT´s lands under temporal conditions. A randomized blocks experimental design in divided plots with two replications was applied; the treatments´ arrangement was a complete factorial 24. The big plots were the lines LE-36, LE-37, LRB-14, D-539, POB 21 y POB 43 and the small ones were the treatments derived from the factors D (Population density) 50 and 62.5 thousand pl ha-1, N, P, (and K with 161-184, 46- 69 and 0-60 kg ha-1, respectively. The lines´ variance analysis showed significance in 14 agronomic characteristics, including grain yield. The high density contributed with the major grain yield with 4083.3 kg ha-1, this surpassed with more than a half ton the lower level of the same. In relation to the lines X treatments interaction, it was found that all the lines increased their grain yield when a higher plant number per area unit was used, however, there was not a response for the same variable with the highest N-P doses and there was a different nutritional exigency of the lines to the individual and mixed application of both macronutriments in their two levels, with respect to grain traits the potassic fertilization benefitted the LE-36, LE-37 and POB 43 lines’ volumetric weight.