Leaching losses from blueberries grown in sandy soils amended with pine bark

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Abstract

Leaching of irrigation water from blueberry (Vaccinium spp.) plants intensifies when sandy soils are amended with pine (Pinus spp.) bark. In a greenhouse study, leaching fractions of water (LFW) and nutrients (LFN) were determined from two blueberry (V. corymbosum L.) cultivars, ‘Emerald’ and ‘Jewel’, grown in biochar-treated and nontreated sandy subsoil and irrigated with drip emitters using one of three pulse frequencies in a factorial design. The LFW was >50% under Emerald and <20% under Jewel, which has a more extensive root system. When the frequency of same volume of irrigation was increased from 2 (F2) to 10 (F10) pulses per day, the average LFW decreased from 46 to 30%. The LFN from a single fertigation was much lower than the total LFN after 6 d of irrigations applied between two fertigation events. The LFN increased linearly with LFW. Amending subsoil with 2% biochar increased soil pH, limited root growth, and did not reduce nutrient leaching. Eighteen months after plant establishment, 1.9% of applied NO3−-N and 2.5% of applied PO43−-P from Emerald and 0.8 and 1.0%, respectively, from Jewel leached below the root zone during a fertigation event. During irrigations following a fertigation event, 10.5% of both NO3−-N and PO43−-P from Emerald and 3.0 and 2.5% from Jewel leached below the root zone. All growth parameters including root/shoot ratio were higher in Jewel than Emerald. This study indicated that leaching rates could be reduced by selecting blueberry cultivars with a dense root system and using a drip irrigation system with >5 pulses d−1 to supply the daily water requirements in pine bark–amended sandy soil.

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CITATION STYLE

APA

Bandaranayake, W. M., Syvertsen, J. P., Schumann, A., & Kadyampakeni, D. M. (2020). Leaching losses from blueberries grown in sandy soils amended with pine bark. Journal of Environmental Quality, 49(6), 1541–1551. https://doi.org/10.1002/jeq2.20169

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