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Organic Wheat Farming Improves Grain Zinc Concentration

Helfenstein, Julian; Müller, Isabel; Grüter, Roman; Bhullar, Gurbir S.; Mandloi, Lokendra; Papritz, Andreas; Siegrist, Michael and Schulin, Rainer (2016) Organic Wheat Farming Improves Grain Zinc Concentration. PLoS ONE, 11 (8), pp. 1-20.

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Online at: http://dx.doi.org/10.1371/journal.pone.0160729

Summary

Zinc (Zn) nutrition is of key relevance in India, as a large fraction of the population suffers from Zn malnutrition and many soils contain little plant available Zn. In this study we compared organic and conventional wheat cropping systems with respect to DTPA (diethylene triamine pentaacetic acid)-extractable Zn as a proxy for plant available Zn, yield, and grain Zn concentration. We analyzed soil and wheat grain samples from 30 organic and 30 conventional farms in Madhya Pradesh (central India), and conducted farmer interviews to elucidate sociological and management variables. Total and DTPA-extractable soil Zn concentrations and grain yield (3400 kg ha-1) did not differ between the two farming systems, but with 32 and 28 mg kg-1 respectively, grain Zn concentrations were higher on organic than conventional farms (t = -2.2, p = 0.03). Furthermore, multiple linear regression analyses revealed that (a) total soil zinc and sulfur concentrations were the best predictors of DTPA-extractable soil Zn, (b) Olsen phosphate taken as a proxy for available soil phosphorus, exchangeable soil potassium, harvest date, training of farmers in nutrient management, and soil silt content were the best predictors of yield, and (c) yield, Olsen phosphate, grain nitrogen, farmyard manure availability, and the type of cropping system were the best predictors of grain Zn concentration. Results suggested that organic wheat contained more Zn despite same yield level due to higher nutrient efficiency. Higher nutrient efficiency was also seen in organic wheat for P, N and S. The study thus suggests that appropriate farm management can lead to competitive yield and improved Zn concentration in wheat grains on organic farms.


EPrint Type:Journal paper
Keywords:Farms, Organic farming, Wheat, system comparison, Department of Internation Cooperation, Agriculture in the Tropics, soil fertility, Zinc, Zn, Crop production
Subjects: Crop husbandry > Production systems > Cereals, pulses and oilseeds
"Organics" in general > Countries and regions > India
Research affiliation: Switzerland > ETHZ - Agrarwissenschaften
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > International Cooperation
India
DOI:10.1371/journal.pone.0160729
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:30776
Deposited On:15 Nov 2016 09:35
Last Modified:15 Nov 2016 09:35
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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