Fall and Spring Phosphorus Fertilization of Potato Using a Dicarboxylic Acid Polymer (AVAIL®)

Stark, J. C.; Hopkins, Bryan G.

doi:10.1080/01904167.2014.983124

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…Although there are several studies which investigate the effect of an in-season P fertiliser application versus a pre-planting P fertiliser application, none could be found which showed an increase in P use efficiency due to splitting of the P application (e.g. Hopkins et al 2010;Stark and Hopkins 2015). However, P petiole tests during crop growth are still recommended to identify possible P limitations for crop growth (Rosen et al 2014).…”

Section: Phosphorousmentioning

confidence: 99%

The Importance of Nutrient Management for Potato Production Part I: Plant Nutrition and Yield

et al. 2019

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As part of a successful agronomic strategy, adequate nutrient management of the potato crop is essential throughout the whole growth period. In this review, the importance of balanced fertilisation for potato yield formation and yield security is addressed by taking advantage of the results of field trials and existing literature. The most important roles of the macronutrients nitrogen, phosphorous, potassium, magnesium, calcium and sulphur in the plant and their importance for yield formation in potato are reviewed. Fertilisation practices in potato production are discussed. Due to their various functions in plant metabolism, the impact of plant nutrients on potato yield is complex. Therefore, interactions with abiotic and biotic factors, for instance interactions between two different plant nutrients in the soil and the plant, are taken into account.

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Section: Phosphorousmentioning

confidence: 99%

The Importance of Nutrient Management for Potato Production Part I: Plant Nutrition and Yield

et al. 2019

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“…It is clear from the work of several researchers (such as Dunn and Stevens, 2008;Hopkins, 2013;and Stark and Hopkins, 2014), as summarized in our analysis, that AVAIL does have the potential to impact yield under specific conditions. It is also clear that this mode of action is related to P nutrition and not biostimulating effects (Dudenhoeffer et al, 2012;Guertal and Howe, 2013;Summerhays et al, 2017).…”

Section: Mode Of Actionmentioning

confidence: 97%

“…This is due to equilibrium chemistry principles that favor higher rates of dissolution of P from soil minerals when there is relatively greater amounts of somewhat soluble P containing minerals (Hopkins, 2015). The positive responses for category 12 is an anomaly as a result of potato data (Hopkins, 2013;Stark and Hopkins, 2014). Potato is known to have relatively greater response to P, even at high STP (Hopkins, 2015;Fixen and Bruulsema, 2014;Rosen et al, 2014).…”

Section: Soil Test Phosphorusmentioning

confidence: 99%

AVAIL Phosphorus Fertilizer Enhancer: Meta‐Analysis of 503 Field Evaluations

et al. 2018

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Core Ideas Meta‐analysis shows a significant yield increase of 2.1% with AVAIL+P fertilizer.Many AVAIL studies were not conducted under P responsive conditions.Likelihood of response increases with low soil test P and P rate and extreme pH.Average yield response increases to 4.6% when only likely to respond sites included.Enhanced efficiency fertilizer should be evaluated under P responsive conditions. AVAIL, a maleic‐itaconic copolymer acid marketed to enhance P fertilizers, has been studied on a variety of crop species. Data from all known field studies comparing P fertilization with and without AVAIL was amassed into a meta‐analysis of 503 field observations. The average yield increase was a modest, although statistically significant, 2.1% (P < 0.0001). However, only 116 of these observations were conducted under conditions where a positive yield response to a P enhancement product would be expected– that is, low soil test phosphorus (STP), strong alkaline or acid pH, and low P fertilizer rate. As such, the data was parsed into a subset of only those observations that were evaluated under responsive conditions, resulting in a greater magnitude of a yield response to AVAIL at 4.6% (P < 0.0001). Further parsing of the data, by eliminating any data not published in refereed or thesis/dissertation sources resulted in an average increase of 5.8% (P = 0.0039). AVAIL effectively increased yields when used appropriately under conditions where a P response was expected. Testing enhanced efficiency fertilizer products in a variety of conditions is useful, but the conclusions from the multitude of studies with AVAIL in environments where no response to P fertilizer enhancement product would be expected may lead to erroneous conclusions if the data is not further parsed and categorized. These data demonstrate the importance of applying fundamental soil fertility principles when designing and evaluating fertilizer crop response studies.

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“…Response to enhanced or specialty fertilizers likely depends on soil's physical and chemical conditions. Stark and Hopkins (2014) agreed that potato yield response to P fertilizer mixed with AVAIL is more likely in an alkaline soil with high calcareousness and a low soil test P than those with lower pH and sufficient soil P; however, these were the types of soil found in the Dolezal et al (2016) study in which AVAIL failed to improve yield or economic return.…”

Section: Introductionmentioning

confidence: 99%

Nontraditional production additives fail to improve potato yield and economic return

Thurgood¹,

Gonzalez‐Tapia

Holden

et al. 2023

Agronomy Journal

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Manufacturers of nontraditional crop additives may claim products will enhance yield and improve economic return, yet many offer only grower testimonials for product validation rather than unbiased, peer-reviewed research. If the products do not perform as described, they may serve to reduce grower revenue. To investigate these claims in potato (Solanum tuberosum L.), field trials were conducted near Othello,Washington from 2016 to 2019 on 27 nontraditional additive treatments composed of 32 products. Treatments were applied using one or more application techniques: in-furrow and surface bands, foliar sprays, and chemigations/fertigations (applied through irrigation system) per manufacturer recommendations and in addition to grower standard practices. Conventional nutrients were applied to be nonlimiting to potato growth. Economic return was calculated using a mock processing contract and adjusted for individual product costs that ranged from US$15 to US$889 ha −1 .Treatment-adjusted gross return values ranged from <7.7% to >8.5% the grower standard treatment value, and total yields ranged from 108 to 136 Mg ha −1 , but differences from the control were not significant for any treatment. Reclaim, a surfactant, and OneUP and NutriCal, both specialty fertilizers, increased US No. 1 yield, average tuber weight, and tuber specific gravity, respectively. Some of the tested products may provide other benefits like soil health improvement or water use reduction but those parameters were not included in this study. Growers should avoid applying unproven products until they are tested and approved by an unbiased, trustworthy research entity.

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Fall and Spring Phosphorus Fertilization of Potato Using a Dicarboxylic Acid Polymer (AVAIL®)

Cited by 7 publications

References 18 publications

The Importance of Nutrient Management for Potato Production Part I: Plant Nutrition and Yield

The Importance of Nutrient Management for Potato Production Part I: Plant Nutrition and Yield

AVAIL Phosphorus Fertilizer Enhancer: Meta‐Analysis of 503 Field Evaluations

Nontraditional production additives fail to improve potato yield and economic return

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