The fertilizer value of agricultural manure: Simple rapid methods of assessment

Piccinini, S.; Bortone, G.

doi:10.1016/0021-8634(91)80039-h

Cited by 48 publications

(39 citation statements)

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“…As previously described by Piccinini and Bortone (1991), Sullivan et al (1994), Chambers (1998), and Salazar et al (2007), DM content was positively correlated with total contents of N (r = 0.80), P (r = 0.95) and K (r = 0.69) ( Table 1). The relationship between P and DM showed the best (P < 0.01) adjustment among the three nutrients (r 2 = 0.90).…”

Section: Resultssupporting

confidence: 64%

“…There was a strong relationship (P < 0.01) between DM readings using the hydrometer and results obtained through conventional laboratory analyses (r 2 > 0.90) ( Table 3). This has been previously highlighted by Kjellerup (1986), Piccinini and Bortone (1991), Chambers (1998) and Chadwick et al (2004). Accurate estimations (P < 0.01) were also obtained when relating total contents of N, P, and K estimated with the hydrometer and results from conventional laboratory analyses.…”

Section: Resultsmentioning

confidence: 58%

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Evaluation of On-Farm Quick Tests on Slurries from Southern Chile Dairy Farms

2012

Chilean J. Agric. Res.

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Currently in Chile, there is a lack of tools to determine the real-time nutrient contribution of slurries. This study aims to evaluate three quick tests for their accuracy in estimating the total contents of N (TN), P (TP), K (TK), and ammonium-N (N-NH 4 + ) in dairy slurries. The quick tests included the Agros Nova Meter, Quantofix N Volumeter, and a hydrometer. While the Agros and Quantofix meters directly measure the ammonium-N content; the hydrometer indirectly estimates the total content of N, P, and K based on linear relationships with the slurry DM. Samples (73) were collected from dairy farms along Southern Chile (39º to 44º S and 71 to 73º W). Analyses were carried out on laboratory conditions using conventional techniques as well as using each of the quick tests. Results were subjected to straight-line regression analyses. Agros and Quantofix N-NH 4 + measurements were accurate (P < 0.01; r 2 > 0.80). The hydrometer estimations of TN, TP, and TK were also reliable (P < 0.01). Best results were obtained with P (r 2 = 0.87) and N (r 2 = 0.79) total contents. To evaluate the kits onfarm and transfer those to dairy producers may constitute a next step towards an efficient management of organic residues in dairy farms in Chile.

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 58%

Evaluation of On-Farm Quick Tests on Slurries from Southern Chile Dairy Farms

2012

Chilean J. Agric. Res.

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“…In plots receiving pig slurry, it was applied instead of urea before planting. The pig slurry application rate was based on the ammonium-N content in pig slurry determined in the field using a Quantofix ® N volumeter (Piccinini & Bortone, 1991). Eighteen trials were sprinkler-irrigated and eight trials were flood-irrigated.…”

Section: General Description Of the Trialsmentioning

confidence: 99%

Utility of the end-of-season nitrate test for nitrogen sufficiency of irrigated maize under Mediterranean semi-arid conditions

Climente

Salmerón

Cavero

et al. 2015

Span. j. agric. res.

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Calibration of decision tools to improve N fertilizer management is critical to increase its adoption by maize (Zea mays L.) growers. The objective of this study was to establish nitrate and total nitrogen concentrations in the basal maize stalks (BMS) at harvest to separate maize fields among three N availability categories (N-deficient, N-optimum, and N-excess) under Mediterranean irrigated semiarid conditions. We analysed data from 26 irrigated maize trials conducted between 2001 and 2012. Trials included treatments receiving different N fertilizer rates and sources (mineral and organic), irrigation systems (flood, sprinkler) and soil types. The critical nitrate concentration in BMS to identify N-deficient plots (CNCL) is affected by the irrigation system. The CNCL was lower under sprinkler irrigation (708 mg NO3-–N/kg) than under flood irrigation (2205 mg NO3-–N/kg), and the later presented a higher degree of uncertainty compared to sprinkler irrigated systems. The results showed the difficulty to identify the N-deficient plots with the BMS test and the higher sensibility of nitrate-N than total-N concentration in BMS to separate N-deficient from N-optimal plots. Under sprinkler irrigation, nitrate in BMS>1500 mg NO3-–N/kg had a 85% probability of having received an excess of N. Considering economic net returns to N fertilization, the range of nitrate concentration in BMS that maximized profit under sprinkler-irrigated conditions was established between 1100 and 1700 mg NO3-–N/kg. Results suggest that BMS test can be useful in detecting plots with an excess of N but considering irrigation efficiency is crucial for stablishing successful CNC thresholds.

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“…Ideally, this byproduct should be managed as a resource (e.g., soil amendment, feedstock for energy production, source of livestock bedding). It is well established that manure provides fertility and tilth benefits to soils (Piccinini and Bortone 1991) and that its carbon 0-500 500-1,000 1,000-2,000 2,000-3,000 >3,000 0-2,000 2,000-5,000 5,000-10,000 10,000-20,000 >20,000…”

mentioning

confidence: 99%