Evaluation of acidifying nitrogen fertilizers in avocado trees with iron deficiency symptoms

Abstract: The control of iron chlorosis by synthetic Fe chelates is costly, and their application can have adverse environmental impacts. We investigated the effectiveness of alternative strategies to prevent Fe chlorosis in avocado based on different acidifying nitrogen fertilizers. The experiment...

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Autores principales:	Granja,Fernando, Covarrubias,José Ignacio
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2018
Materias:	ammonium sulfate urea DMPP iron chlorosis Persea americana Mill
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000100157
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spelling	oai:scielo:S0718-951620180001001572018-11-21Evaluation of acidifying nitrogen fertilizers in avocado trees with iron deficiency symptomsGranja,FernandoCovarrubias,José Ignacio ammonium sulfate urea DMPP iron chlorosis Persea americana Mill Abstract: The control of iron chlorosis by synthetic Fe chelates is costly, and their application can have adverse environmental impacts. We investigated the effectiveness of alternative strategies to prevent Fe chlorosis in avocado based on different acidifying nitrogen fertilizers. The experiment was conducted on a commercial orchard of avocado cv. Hass cultivated in a calcareous soil. The application of (NH4)2SO4 was highly effective at reducing the soil pH and, when applied with a nitrification inhibitor, at increasing the leaf chlorophyll concentration in trees. Fertilization with urea was also effective at increasing leaf chlorophyll, but only when applied without a nitrification inhibitor. However, the acidifying effect of urea on the soil was significantly lower than (NH4)2SO4. The different N sources also modified the concentration of N-NO3 -, N-NH4 + and total N within the leaves, but did not influence the length of the shoots or the leaf gaseous exchange. These results suggest that the fertilization strategy based on (NH4)2SO4 + DMPP or urea can be an effective and sustainable alternative to counteract Fe chlorosis symptoms in avocado trees. Our results provide evidence of the effectiveness of agronomic strategies, alternative to synthetic Fe chelates, for preventing Fe deficiency in avocado.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.18 n.1 20182018-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000100157en10.4067/S0718-95162018005000702
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	ammonium sulfate urea DMPP iron chlorosis Persea americana Mill
spellingShingle	ammonium sulfate urea DMPP iron chlorosis Persea americana Mill Granja,Fernando Covarrubias,José Ignacio Evaluation of acidifying nitrogen fertilizers in avocado trees with iron deficiency symptoms
description	Abstract: The control of iron chlorosis by synthetic Fe chelates is costly, and their application can have adverse environmental impacts. We investigated the effectiveness of alternative strategies to prevent Fe chlorosis in avocado based on different acidifying nitrogen fertilizers. The experiment was conducted on a commercial orchard of avocado cv. Hass cultivated in a calcareous soil. The application of (NH4)2SO4 was highly effective at reducing the soil pH and, when applied with a nitrification inhibitor, at increasing the leaf chlorophyll concentration in trees. Fertilization with urea was also effective at increasing leaf chlorophyll, but only when applied without a nitrification inhibitor. However, the acidifying effect of urea on the soil was significantly lower than (NH4)2SO4. The different N sources also modified the concentration of N-NO3 -, N-NH4 + and total N within the leaves, but did not influence the length of the shoots or the leaf gaseous exchange. These results suggest that the fertilization strategy based on (NH4)2SO4 + DMPP or urea can be an effective and sustainable alternative to counteract Fe chlorosis symptoms in avocado trees. Our results provide evidence of the effectiveness of agronomic strategies, alternative to synthetic Fe chelates, for preventing Fe deficiency in avocado.
author	Granja,Fernando Covarrubias,José Ignacio
author_facet	Granja,Fernando Covarrubias,José Ignacio
author_sort	Granja,Fernando
title	Evaluation of acidifying nitrogen fertilizers in avocado trees with iron deficiency symptoms
title_short	Evaluation of acidifying nitrogen fertilizers in avocado trees with iron deficiency symptoms
title_full	Evaluation of acidifying nitrogen fertilizers in avocado trees with iron deficiency symptoms
title_fullStr	Evaluation of acidifying nitrogen fertilizers in avocado trees with iron deficiency symptoms
title_full_unstemmed	Evaluation of acidifying nitrogen fertilizers in avocado trees with iron deficiency symptoms
title_sort	evaluation of acidifying nitrogen fertilizers in avocado trees with iron deficiency symptoms
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000100157
work_keys_str_mv	AT granjafernando evaluationofacidifyingnitrogenfertilizersinavocadotreeswithirondeficiencysymptoms AT covarrubiasjoseignacio evaluationofacidifyingnitrogenfertilizersinavocadotreeswithirondeficiencysymptoms
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Evaluation of acidifying nitrogen fertilizers in avocado trees with iron deficiency symptoms

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