Over fertilization limits lettuce productivity because of osmotic stress

It is customary that growers apply high doses of nutrients to the soil in order to achieve high yields, with detrimental consequences for the environment; but no information exists with regards to the crop response to high fertilization levels. To evaluate the physiological response of lettuce (Lact...

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Autores principales:	Albornoz,Francisco, Heinrich Lieth,J
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2015
Materias:	Aeroponics chlorophyll fluorescence Lactuca sativa leaf nitrate content nutrient accumulation tissue nutrient concentration
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000400003
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spelling	oai:scielo:S0718-583920150004000032018-10-01Over fertilization limits lettuce productivity because of osmotic stressAlbornoz,FranciscoHeinrich Lieth,J Aeroponics chlorophyll fluorescence Lactuca sativa leaf nitrate content nutrient accumulation tissue nutrient concentration It is customary that growers apply high doses of nutrients to the soil in order to achieve high yields, with detrimental consequences for the environment; but no information exists with regards to the crop response to high fertilization levels. To evaluate the physiological response of lettuce (Lactuca sativa L.) to various root zone nutrient concentrations (expressed as electrical conductivity, from 0.6 to 10 dS m-1), a replicated experiment was conducted using increasing concentrations of macronutrients applied to the root zone in an aeroponic system. Leaf photosynthesis and chlorophyll fluorescence were measured using a portable infrared gas analyzer attached with a fluorometer. Leaf nutrient content was analyzed by mass spectrometry and NO3-N was determined by flow injection analysis. Leaf photosynthetic rates increased when the solution concentration was raised from 0.6 to 4.8 dS m-1, but further increases in solution concentration did not result in any differences. The enhancement in photosynthetic rates was related to higher concentrations of N, P, Mg, and S in leaves. Leaf K content was correlated with stomatal conductance. Maximum growth was achieved with solution concentrations between 1.2 and 4.8 dS m-1 while at 10.0 dS m-1 leaf production was reduced by 30%. It is concluded that at high concentration of nutrients supplied in the root zone, yield reduces because of a combination of decreased stomatal conductance and leaf area.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.75 n.3 20152015-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000400003en10.4067/S0718-58392015000400003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Aeroponics chlorophyll fluorescence Lactuca sativa leaf nitrate content nutrient accumulation tissue nutrient concentration
spellingShingle	Aeroponics chlorophyll fluorescence Lactuca sativa leaf nitrate content nutrient accumulation tissue nutrient concentration Albornoz,Francisco Heinrich Lieth,J Over fertilization limits lettuce productivity because of osmotic stress
description	It is customary that growers apply high doses of nutrients to the soil in order to achieve high yields, with detrimental consequences for the environment; but no information exists with regards to the crop response to high fertilization levels. To evaluate the physiological response of lettuce (Lactuca sativa L.) to various root zone nutrient concentrations (expressed as electrical conductivity, from 0.6 to 10 dS m-1), a replicated experiment was conducted using increasing concentrations of macronutrients applied to the root zone in an aeroponic system. Leaf photosynthesis and chlorophyll fluorescence were measured using a portable infrared gas analyzer attached with a fluorometer. Leaf nutrient content was analyzed by mass spectrometry and NO3-N was determined by flow injection analysis. Leaf photosynthetic rates increased when the solution concentration was raised from 0.6 to 4.8 dS m-1, but further increases in solution concentration did not result in any differences. The enhancement in photosynthetic rates was related to higher concentrations of N, P, Mg, and S in leaves. Leaf K content was correlated with stomatal conductance. Maximum growth was achieved with solution concentrations between 1.2 and 4.8 dS m-1 while at 10.0 dS m-1 leaf production was reduced by 30%. It is concluded that at high concentration of nutrients supplied in the root zone, yield reduces because of a combination of decreased stomatal conductance and leaf area.
author	Albornoz,Francisco Heinrich Lieth,J
author_facet	Albornoz,Francisco Heinrich Lieth,J
author_sort	Albornoz,Francisco
title	Over fertilization limits lettuce productivity because of osmotic stress
title_short	Over fertilization limits lettuce productivity because of osmotic stress
title_full	Over fertilization limits lettuce productivity because of osmotic stress
title_fullStr	Over fertilization limits lettuce productivity because of osmotic stress
title_full_unstemmed	Over fertilization limits lettuce productivity because of osmotic stress
title_sort	over fertilization limits lettuce productivity because of osmotic stress
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000400003
work_keys_str_mv	AT albornozfrancisco overfertilizationlimitslettuceproductivitybecauseofosmoticstress AT heinrichliethj overfertilizationlimitslettuceproductivitybecauseofosmoticstress
_version_	1714205349963104256

Over fertilization limits lettuce productivity because of osmotic stress

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