PHOSPHATE FERTILIZATION EFFICIENCY IN SOYBEAN CULTIVARS INDICATED FOR CERRADO TROPICAL SOIL REGIONS

Felipe Ferreira Da Silva,Mickaelle Alves De Sousa Lima,Roldão Carlos Andrade Lima,Gisellya Da Silva Cruz,Deurimar Herênio Gonçalves Junior,Wallysson Nascimento Lima

doi:10.28998/rca.v17i3.7803

Abstract

Phosphorus deficiency (P2O5) is among the main abiotic stresses that limit soybean production in cerrado soils. Its low availability in soils, especially in the more weathered and acidic ones, the increased demand and its scarcity estimations leadto the need for the development of cultivars more efficient in the use of this mineral. This experiment was conducted under field conditions in the municipality of Imperatriz, state of Maranhão, Brazil, under planosol conditions, in a randomized complete block design, with treatments arranged in a 2x4 factorial scheme with four replicates, four P levels (0, 60, 120 and 180 kg ha-1), and two soy bean cultivars (BRS 333 RR and BRS 9180 IPRO) indicated for tropical regions or Brazilian cerrado. In this study, P2O5 efficiency use was evaluated based on plant height, shoot dry mass (SDM), pod dry mass (PDM) and number of pods (NP). BRS 333 RR cultivar obtained the highest efficiency with doses of 84.35 kg ha-1 and 94.46 kg.ha-1, producing 696,76.76g e 86,72.06g for SDM and PDM respectively, average height of94.15 cm with 123.98 kh.ha-1 and phosphate fertilizer use efficiency (FUE) of 13%

Highlights

Among the three primary macronutrients (N, P and K), phosphorus (P2O5) is the least extracted by plants and is usually the nutrient used in greater amounts as fertilizer
The objective was to evaluate the efficiency of phosphate fertilization in commercial soybean cultivarsof Brazilian cerrado soils, identifying the most efficient P use cultivar (FUE) and if this cultivar is the most productive in terms of shoot dry matter (SDM), pod dry mass (PDM), number of pods (NP) and responsive regarding height parameter
Treatment with no phosphate fertilization obtained average shoot dry mass (SDM) higher than treatment with 180 kg ha-1. This behavior evidences the lack of need of phosphate fertilization for this soybean cultivar under similar fertility conditions.When evaluating SDM of BRS 9180 IPRO cultivar (Figure 1), significant linear decrease was observed as phosphate fertilizer doses increased

Summary

INTRODUCTION

Among the three primary macronutrients (N, P and K), phosphorus (P2O5) is the least extracted by plants and is usually the nutrient used in greater amounts as fertilizer. Stress caused by low P availability in the soil leadsthe efficiency of nutrient utilization by plants to be different among species and among cultivars of the same species (MAHANTA et al, 2014; LYNCH, 2015; FAGERIA, 2016). Estimates of scarcity combined with low P soil availability, successive increases in phosphate fertilizer and food prices, and potential geopolitical stress indicate the need to improve phosphorus (P) efficiency of the agricultural sector by developing strategies, together with good management practices, allowing plants to be more efficient in the absorption and utilization of nutrients. The objective was to evaluate the efficiency of phosphate fertilization in commercial soybean cultivarsof Brazilian cerrado soils, identifying the most efficient P use cultivar (FUE) and if this cultivar is the most productive in terms of shoot dry matter (SDM), pod dry mass (PDM), number of pods (NP) and responsive regarding height parameter

MATERIAL AND METHODS

RESULTS AND DISCUSSION

Lucas do Rio Verde