Abstract
ABSTRACT The objective of this work was to evaluate the carrot crop recovery efficiency of nitrogen, phosphorus and potassium from fertilizers. Two experiments were conducted in an experimental area in Rio Paranaiba - MG. The cultivar ("Juliana‟) was sown during the summer period and the cultivar "Nayarit‟ during the winter period. In both experiments, the treatments consisted of six fertilization combinations of N, P2O, K2O (kg ha-1): fertilization without N (0-500-450), without P (100-0-450), without K (100-500-0), standard (100-500-450), higher than standard (100-700-600) and lower than standard (100-300-300). The harvest was carried out when most of the roots presented commercial standard well accepted by the consumers. The fresh and dry matter of roots and leaves were quantified, and the yield was calculated based on the fresh matter. The analysis of N, P and K contents in leaves and roots were carried out by harvest time, and the nutrients absorption and exportation were determined based on these contents and on the dry matter of roots and leaves. N, P and K omissions reduced the yield of the cultivar "Juliana‟. For the cultivar "Nayarit‟, only P omission reduced and P and K fertilizations increased the yield. The cultivar "Nayarity‟, which is more productive than "Juliana", absorbed more quantities of N, P and K. Carrot recovery efficiency of nitrogen, phosphorus and potassium is low.
Highlights
Carrot (Daucus carota L.) is among the ten most economically important vegetable in the world
The decreasing order of macronutrients extracted by carrot crops is usually: K, N, Ca, P, S and Mg (CECILIO FILHO; PEIXOTO, 2013)
Potassium and N are absorbed by carrot in quantities larger than other nutrients (CECILIO FILHO; PEIXOTO, 2013) and fertilization with these nutrients is usually performed as split topdressings
Summary
Carrot (Daucus carota L.) is among the ten most economically important vegetable in the world. Fertilization has significant importance in production costs and directly influences the carrot root production and quality (LUZ et al, 2009b). High doses of fertilizers are often applied aiming to increase its root size and yield, and improve its appearance to reach a good market price (BRUNO et al, 2007). The decreasing order of macronutrients extracted by carrot crops is usually: K, N, Ca, P, S and Mg (CECILIO FILHO; PEIXOTO, 2013). The quantitative values of N, P and K is very important (LUZ et al, 2009b). P is applied at larger quantities because of this nutrient loss due to its strong adsorption to iron and aluminum oxides (MOREIRA et al, 2006). Potassium and N are absorbed by carrot in quantities larger than other nutrients (CECILIO FILHO; PEIXOTO, 2013) and fertilization with these nutrients is usually performed as split topdressings. Possible salinity effects in the crop initial stage and losses are minimized
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