RENDIMENTO DE CEBOLA ORGÂNICA SOB DOSES DE FÓSFORO E POTÁSSIO A PARTIR DE ROCHAS SILICATADAS

Abstract

To obtain good results on onion (Allium cepa L.) productivity, should pay attention to several factors, especially nutrition, which is a determining factor for culture success or unsuccess in agriculture. The objective of this work was to evaluate the onion response under different percentages of fertilization, using two silicate rocks sources. The Ekosil® rock powder and the Yoorin MG® were used as potassium (K) and phosphorus (P) sources, respectively, associated with cattle manure (CM) as Nitrogen (N) source. The experimental design was a randomized block design, consisting of 09 treatments (T) with 4 replicates (T1 – Conventional fertilization; T2 – 25%, T3 - 50%, T4 – 75%, T5 – 100%, T6 – 125%, T7 – 150%, T8 – 175%, T9 – 200 % of K2O and P2O5 + CM), Totalizing 36 repetitions. The parameters evaluated were: Fresh mass (FM), Bulb diameter (BD), Bulb height (BH) and Productivity (PDT). This work demonstrated that Yoorin MG and Ekosil rocks powder associated with manure, compared to conventional fertilization and control in onion culture were efficient.