Comparison of Agrotain-treated and standard urea on an irrigated dairy pasture

Martin, R. J.; Weerden, Tony J. van der; Riddle, Matthew; Butler, R.C.

doi:10.33584/jnzg.2008.70.2732

Cited by 12 publications

(9 citation statements)

References 5 publications

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“…Fig. 10 shows the distribution of the differences between urea40+LessN Stafford et al 2008;Martin et al 2008).…”

Section: Lessnmentioning

confidence: 99%

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Evaluating the Agronomic Effectiveness of Fertiliser Products

Edmeades¹,

Mcbride²

2012

ProNZG

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One of the problems which arises when analysing and interpreting results from field trials designed to test the efficacy of fertilisers and fertiliser-type products on pastures and crops is the conundrum of Type 1 and Type 2 statistical errors: is the product having literally no effect, or is the trial not "powerful" enough to detect small differences. This problem can be objectively and pragmatically solved, when sufficient trial data are available, by using cumulative frequency distribution functions. In this paper we explain what cumulative frequency distribution functions are and their usefulness for determining the agronomic effectiveness of products. This technique is then applied to field trial data testing the effectiveness of a number of fertiliser and fertiliser-type products used in agriculture today. It is concluded that this approach provides a more objective basis for determining the efficacy or otherwise of fertilisers. Keywords: fertilisers, agronomic effectiveness, testing, field trials, cumulative frequency distribution.

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“…Fig. 10 shows the distribution of the differences between urea40+LessN Stafford et al 2008;Martin et al 2008).…”

Section: Lessnmentioning

confidence: 99%

“…Fig. 11 shows the differences in pasture production between urea and SustaiN as measured in 16 field trials (see Stafford et al 2008 andMartin et al 2008 for the individual trial results). The results are approximately evenly distributed around zero (range -25%-53%) with an average of 4% (CI = 7%).…”

Section: Sustainmentioning

confidence: 99%

Evaluating the Agronomic Effectiveness of Fertiliser Products

Edmeades¹,

Mcbride²

2012

ProNZG

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“…The 13 trials conducted by Stafford, Catto, and Morton (2008), which were conducted in periods expressly intended to avoid ammonia volatilization risk, had a mean of only 1.02. Martin et al (2008) trials resulted in response ratios of 1.25 and 1.81 for two trials, but just 1.01 for the third trial, which was reported to have limited volatilization potential due to rainfall.…”

Section: Meta-analysis Of Sustain Green Trialsmentioning

confidence: 96%

“…Of the 16 trials assessed by Edmeades and McBride (2012), 13 were from a series reported by Stafford, Catto, and Morton (2008), on sites, times, or conditions expressly chosen as being less conducive to volatilization. In the remaining three (independent) trials, reported by Martin et al (2008), one trial had pre-and post-application rainfall considered by the original authors to have greatly reduced the potential for volatilization. The remaining two trials demonstrated statistically significant yield increases for SustaiN Green over uncoated urea.…”

Section: Sustain Greenmentioning

confidence: 99%

How well do fertilizer enhancers work?

Jenkins

Randhawa

Jenkins³

2018

Journal of Plant Nutrition

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Fertilizer enhancers can provide economic and environmental benefits but their efficacy needs to be assessed appropriately. This study analyzed available trial results of three different fertilizer enhancer products to determine if the results support product claims. All available trial results were considered for a metaanalysis of each product. Product effect was calculated for each experiment in a manner that could be compared with manufacturer claims. The distribution of trial results was examined and factors that may have influenced results assessed. Previously published assessments of the products were compared. N-Boost biostimulant sprayed with dissolved urea increased pasture nitrogen response by an equivalent of 18.0 kg N/ha compared to urea alone in nitrogenresponsive and label-conditions trials. For SustaiN Green urease-inhibitortreated urea, pasture nitrogen response was 50% higher than untreated urea if low-ammonia-volatilization-risk trials were excluded. AVAIL phosphate fertilizer enhancer increased crop yields by 4.1% over untreated fertilizer in fertilizerresponsive and non-high-soil-phosphate trials.

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“…One of the most promising approaches is to apply urea in combination with the urease inhibitor (N-(n-butyl) thiophosphoric triamide, nBTPT or NBPT) at low concentrations ranging from 0.01 to 0.5% (NBPT, w/w) (Sanz-Cobena et al, 2008). Granular urea applications with NBPT have been reported by a number of researchers to be effective in delaying urea hydrolysis as well as increasing productivity under a range of cropping and pasture systems (Martin et al, 2008) A low N-response efficiency of granular urea shows that a large percentage of the applied fertilizer N is not being used for productive purposes and is potentially lost to recipient ecosystems) Howarth and Marino,2006).…”

Section: Introductionmentioning

confidence: 99%

Integrated Effect of Urea and Urease Inhibitor on Wheat Productivity.

Fouda

2013

Journal of Soil Sciences and Agricultural Engineering

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A field experiment was conducted on a special farm near kafr El-sheikh, kafr El-sheikh governorate, during the winter season 2012 / 2013 to investigate the effect of urea fertilizer levels in the presence or absence of urease inhibitor thiophosphoric triamide (NBPT) on wheat plant. Six treatments were arranged in a split-block design, which were the simple possible combination between three levels of urea fertilizer i.e.50, 75 and 100kg N/fed for wheat plant as main plots and two treatments of (NBTP) (0 and 4% from the N-level), each treatment was replicated three times. Results indicated that; the average values of growth parameters, yield and its components and chemical composition of wheat plant were significantly increased as the level of N-fertilization was increased either in the presence or absence of urease inhibitor, but the rate of increases for the plants treated with (NBTP) were more than that obtained from the untreated plants. On the contrary of this trend, adding of Nlevels in single form significantly increase the average values of nitrate and nitrite contents in wheat plant as the level of N-fertilization was increased while, such effect was sharply and significantly decreased due to an adding of (NBTP) in combination with the same levels of N-fertilization. The most suitable treatment which realized the highest yield of grain of wheat plant was connected with the plants treated with 100 kg N/fed combined with urease inhibitor.

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Comparison of Agrotain-treated and standard urea on an irrigated dairy pasture

Abstract: Trials were started in spring, summer and autumn to compare the effect of Agrotain-treated urea and standard urea, at application rates of 25, 50, 75 and 100 kg N/ha, on dairy pasture production on a commercial dairy farm in Canterbury. Keywords: nitrogen, urea, Agrotain, pasture, yield

Cited by 12 publications

References 5 publications

Evaluating the Agronomic Effectiveness of Fertiliser Products

Evaluating the Agronomic Effectiveness of Fertiliser Products

How well do fertilizer enhancers work?

Integrated Effect of Urea and Urease Inhibitor on Wheat Productivity.

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