NUTRIENT RECOMMENDATION MODEL FOR CARROT CROP – FERTICALC CARROT

Luciel Rauni Dezordi,Luiz Paulo Dornelas Dos Santos,Priscila Maria De Aquino,Roberto Ferreira Novais,Leonardo Angelo De Aquino

doi:10.1590/01000683rbcs20150065

Luciel Rauni Dezordi, Luiz Paulo Dornelas Dos Santos + Show 3 more

Open Access

https://doi.org/10.1590/01000683rbcs20150065

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Abstract

ABSTRACT The literature on fertilization for carrot growing usually recommends nutrient application rates for yield expectations lower than the yields currently obtained. Moreover, the recommendation only considers the results of soil chemical analysis and does not include effects such as crop residues or variations in yield levels. The aim of this study was to propose a fertilizer recommendation system for carrot cultivation (FERTICALC Carrot) which includes consideration of the nutrient supply by crop residues, variation in intended yield, soil chemical properties, and the growing season (winter or summer). To obtain the data necessary for modeling nutritional requirements, 210 carrot production stands were sampled in the region of Alto Paranaíba, State of Minas Gerais, Brazil. The dry matter content of the roots, the coefficient of biological utilization of nutrients in the roots, and the nutrient harvest index for summer and winter crops were determined for these samples. To model the nutrient supply by the soil, the literature was surveyed in regard to this theme. A modeling system was developed for recommendation of macronutrients and B. For cationic micronutrients, the system only reports crop nutrient export and extraction. The FERTICALC which was developed proved to be efficient for fertilizer recommendation for carrot cultivation. Advantages in relation to official fertilizer recommendation tables are continuous variation of nutrient application rates in accordance with soil properties and in accordance with data regarding the extraction efficiency of modern, higher yielding cultivars.

Highlights

Many recommendations of quantities of nutrients are made based on information available in tables published in state manuals; some inadequacies can be seen in regard to this method of recommendation
This includes information on the dry matter content (DMc), the coefficient of biological utilization (CBU), the harvest index (HI), and recovery efficiency (RE) by the plant of the nutrients applied on the soil
In the simulations generated by FERTICALC Carrot, the supply (SUP) of Ca and Mg via liming and the SUP of Ca and S via gypsum application were not considered since application of these soil amendments was not necessary, based on the results of chemical analysis used in the simulation (Table 4)

Summary

Introduction

Many recommendations of quantities of nutrients are made based on information available in tables published in state manuals; some inadequacies can be seen in regard to this method of recommendation. The constant lack of updating in relation to new cultivars/hybrids that arise on the market, and the non-representative nature of yield levels that are generally less than those obtained from technologically advanced crops are the main negative points of this method of recommendation (Oliveira et al, 2007; Santos et al, 2008; Silva et al, 2009) To overcome these problems, some nutrient recommendations are being made through the nutrient balance method (Haefele et al, 2003; Silva et al, 2009). The RE indicates the percentage of nutrient applied to the soil that the plant recovers (Fageria, 1998)

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