Efectividad del 3,4- dimetilpirazolfosfato (DMPP) en naranjo dulce en el noreste Argentino

Abstract

RESUMEN -El objetivo del trabajo fue evaluar el efecto del 3,4-dimetilpirazol fosfato (DMPP) en la eficiencia de la fertilización amoniacal, en naranjo dulce [Citrus sinensis (L.) Osbeck] 'Valencia late' sobre suelo arenoso, en la provincia de Corrientes, Argentina. Durante tres campañas se trabajó en un huerto de naranjo 'Valencia late' injertado sobre lima de Rangpur (Citrus limonia, Osbeck), sobre un suelo tipo Udipsamment alfico. Se utilizó un Diseño de Bloques Completos al Azar con cuatro repeticiones, parcela útil una planta más borduras, con los tratamientos: 1. (Testigo) 150 kg de N ha -1 (fertilizante 15-6-15-6); T2. 75 kg de N ha -1 (sulfonitrato de amonio (SNA) 26 % N) tratado con DMPP (0,8% respecto al N amoniacal); T3. 150 kg de N ha -1 (SNA 26 % N), tratado con DMPP (0,8% respecto al N amoniacal). En el otoño se tomaron muestras foliares de ramas fructíferas, determinándose contenido de N, P y K. En la cosecha se determinó producción por planta (kg) y se evaluó calidad de frutos. Los resultados obtenidos permiten establecer que en suelos arenosos, el agregado de DMPP mejora la eficiencia de la fertilización nitrogenada. Con igual aporte nitrogenado, se incrementan los rendimientos y las concentraciones foliares de N y con la mitad de la dosis se logran rendimientos equivalentes al testigo. Palabras clave: Inhibidores nitrificación -Citrus sinensis -fertilización -productividad. 3,4-DIMETHYLPYRAZOLE PHOSPHATE (DMPP) EFFICIENCY IN SWEET ORANGE IN ARGENTINA NORTHEASTABSTRACT -The aim of this study was to evaluate the 3,4-dimethylpirazol phosphate (DMPP) effect on the efficiency of ammonium-N fertilization on sandy soil of Corrientes, Argentina. The experiment was carried out with sweet orange [Citrus sinensis (L.) Osbeck] 'Valencia late' grafted on Rangpur lime (Citrus limonia, Osbeck) rootstock under field conditions during three consecutive years, the orchard was established on an alfic Udipsamment soil. A randomized complete block statistical design with four replications was used and the treatments were: 1. (Control) 150 kg N ha -1 (fertilizer 15-6-15-6); 2. 75 kg N ha -1 (ammonium sulphonitrate (SNA) 26% N) treated with DMPP (0.8% compared to ammonia N); 3. 150 kg N ha -1 (SNA 26% N), treated with DMPP (0.8% compared to ammonia N). Leaf samples from fruitful branches were taken in autumn and the amount of N, P and K were analysed. At harvest, yield per plant was measured (kg) and quality of fruits was assessed. The results obtained demonstrate that in sandy soils, the addition of DMPP improves the efficiency of nitrogen fertilization. Identical nitrogen supply, increase yields and foliar concentrations of N and with the half N dosage, control equivalent yields were achieved.

Use of Nitrification Inhibitor DMPP to Improve Nitrogen Uptake Efficiency in Citrus Trees

“…Increasing N concentrations in woody organs and in total-tree average were obtained with the DMPP are consistent with the enhancement of N concentrations in spring-flush leaves of AN+DMPP supplied adult trees (Quiñones et al, 2009;Rodríguez et al, 2011). Thus, the results showed that total 15 N uptake significantly increased with the addition of DMPP.…”

“…In citrus trees, the use of nitrification inhibitors (i.e., nitrapyrin; 2,5-dichlorophenyl succinamic acid; DCD) also has been reported to increase fruit yields when compared to ammonium fertilizers (Liu et al, 1983;Serna et al, 1994). Rodríguez et al (2011) obtained a three-year average fruit yield increase of 21% in a commercial orchard when DMPP was added to ammonium sulphonitrate. Nevertheless, Quiñones et al (2009) found no differences in total yield when incorporating DMPP to AS and reported a significant increase in the number of fruits per tree.…”