Efeito do nitrogênio, calcário e gesso agrícola em alguns atributos de um latossolo e no desenvolvimento de gladíolo

Abstract

This work was developed in Gardening at UFMS (Universidade Federal de Mato Grosso do Sul) NCA (Núcleo Experimental de Ciências Agrárias), from September 2004 to February 2006 having the aim of valuating nitrogen, limestone and phosphogypsum over gladiolus development and over some chemical and physical characteristics of a dystroferric red latosol. Plants were valuated by leaf analysis, maximum high, spike and floral stem length, new corm diameter, dry and live mater form shoot area, and produced cormel number. Soil physical characteristics valuated the meaning clay, the meaning clay disperse in water, flocculation degree, aggregation and aggregation stableness. Soil chemical characteristics considered water and CaCl2 pH, macro and micronutrients meaning, exchangeable acidity, effective kation exchange capacity and base saturation. The experiment analysis was done in randomized blocks sub-subdivided in parcels, considering as parcel the nitrogen proportions (150, 300 kgha-1), as sub parcel the limestone proportion (0, 2000, 4000, 8000 kgha-1) and as sub-sub parcel phosphogypsum proportion (0, 500, 1000, 2000 kgha-1), in four repetitions. Nitrogen, limestone and Phosphogypsum proportions used caused no visual deficiencies detected in gladiolus. The smaller flowering time and the bigger live matter plants were gained without using limestone and / or phosphogypsum. Limestone between 6000 and 8000 kg.ha-1, contributed into ideal pH levels.