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L.B. Fenn, H.L. Malstrom, T. Riley and G.L. Horst

Acidification of < 1% of the effective root zone of a mature pecan tree (Carya illinoensis (Wanghenh.) C. Koch) significantly increased uptake of Zn into the tree and maintained elevated Zn in leaves for 9 years. Sulfuric acid and ZnSO4, applied in a shallow trench, lowered soil pH to a depth of 60 cm and increased volubility of Zn in the acid band. Large concentrations of CaSO4 were formed. Laboratory tests confirmed the movement and volubility of Zn in soils under conditions similar to those in the field. Tree roots did not grow into the acidified band, presumably due to high salinity, but proliferated extensively at the interface of the acidified band and calcareous soil.

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Rhoda L. Burrows and Frank J. Peryea

Nitrification-induced subsoil acidification is a major problem encountered with the use of ammonium- or urea-containing fertilizer solutions for drip fertigation of tree fruit crops. We conducted a laboratory experiment to evaluate the soil acidification potential of the four fertilizer N solutions most frequently used for fertigation within the Washington tree fruit industry. Treatments were five orchard soils x four commercial N solutions (calcium nitrate, calcium-ammonium nitrate, ammonium nitrate, urea-ammoniun nitrate) x four N rates (0, 100, 200, 500 mg N/kg). Air-dry subsamples of each soil were inoculated with fresh soil known to exhibit nitrifying behavior amended with treatment solutions. Subsamples were maintained at simulated field capacity of –15 kPa. Soil pH was measured after 5 weeks incubation. The treatment solutions were reapplied and pH measured after another 5 weeks. The soil were then leached with distilled water and further incubated to determine if pH would increase as has been observed in the field. The fertilizer solutions acidified the soils in direct relation to their ammonium plus urea content. The calcium nitrate solution was acidifying because it contains ammonium nitrate as an impurity. We will present the pH “rebound” data.

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Christopher S. Imler, Camila I. Arzola and Gerardo H. Nunez

acidify blueberry fertigation ( Gallegos-Cedillo et al., 2018 ). In addition, blueberry soils can have high nitrification rates ( Hanson et al., 2002 ). Our results suggest that using NO 3 – for blueberry fertilization might lead to rhizosphere

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Gerardo H. Nunez, James W. Olmstead and Rebecca L. Darnell

where the sampling method used—based on root order—accounted for size and developmental differences. The failure of both VA and SHB to acidify the nutrient solution and the gels suggests that the wider soil adaptation of VA compared with SHB ( Hancock et

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Ryan C. Costello, Dan M. Sullivan, David R. Bryla, Bernadine C. Strik and James S. Owen

; Krewer and Ruter, 2012 ). Ideally, a suitable compost for blueberry will contain manageable levels of soluble salts and K and will not increase soil pH above 5.5. Costello and Sullivan (2014) successfully acidified a wide range of composts by adding

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Zhi Quan, Bin Huang, Caiyan Lu, Yi Shi, Yanhong Cao, Yongzhuang Wang, Chuanrui He, Guangyu Chi, Jian Ma and Xin Chen

chemical N fertilizer to buffer soil acidification, improve microbial activity and functional diversity, provide nutrients, and maintain the sustainable productivity ( Hati et al., 2008 ; Shen et al., 2010 ; Zhao et al., 2012 ). The relatively low cost of

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Monica Ozores-Hampton

, 2005 ; Liu et al., 2012 ). Table 4. Soil and foliar applied iron (Fe) fertilizer sources and survey response used in vegetable production in Florida. Water and soil acidification treatments were used by 10% to 20% of the vegetable growers using drip

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Gaofeng Zhou, Bixian Li, Jianmei Chen, Fengxian Yao, Guan Guan, Guidong Liu and Qingjiang Wei

Abiotic stresses, such as nutrient disorder and soil acidification, are dominant soil factors that affect plant performance. It is well known that B is an essential micronutrient for vascular plants ( Marschner, 1995 ), and it has an important role

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Robert C. Ebel, Said Hamido and Kelly T. Morgan

Florida are based ( Obreza and Morgan, 2008 ). Thus, the greater acidification of soil by HLB-affected roots increased Cu availability, which promoted uptake and greater Cu concentrations in leaves and roots compared with the non-HLB controls. Essential

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T.L. Creger and F.J. Peryea

Department of Crop and Soil Sciences paper no. 9201-42, Project 0747, College of Agriculture and Home Economics, Washington State Univ., Pullman. This research was funded in part by the Washington State Tree and Fruit Research Commission and