Diagnóstico de requerimiento de fósforo para alfalfa (Medicago sativa L.) en argiudoles

Marino, María A.; Echeverría, Hernán Eduardo

doi:10.31047/1668.298x.v1.n35.20449

Cited by 2 publications

(2 citation statements)

References 17 publications

(29 reference statements)

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“…For every ton of DM produced, lucerne requires about 2.6 kg of P (approximately 6 kg of P 2 O 5 ) (Garcia, Micucci, Rubio, Ruffo, & Daverede, 2005). Critical extractable soil P (Bray) for lucerne has been found to be between 16 and 20 ppm in the Argentinian Pampas and lucerne yields were reduced to less than 60% of their potential when soil P (Bray) fell below 7 ppm in similar environments (Díaz‐Zorita & Buschiazzo, 2004; Marino & Echeverría, 2018). Such reductions could be linked to reductions in RUE and IPAR.…”

Section: Resultsmentioning

confidence: 99%

Yield gaps of lucerne (Medicago sativa L.) in livestock systems of Argentina

Jáuregui

Ojeda²,

Berone

et al. 2022

Annals of Applied Biology

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Argentina grows the second-largest area of lucerne in the world. Despite its importance, a yield gap exists between potential and measured yields, but factors contributing to it are still unclear. This study aimed to identify management factors and research needs to reduce the lucerne yield gap to improve the livestock systems in this region. We used meteorological data coupled with lucerne crop modelling and measured yields from the National Lucerne Cultivar Evaluation Network (NLCEN) to quantify the lucerne yield gap in nine sites located within the Argentinian Pampas (between parallels 30-45 S and meridians 58-65 W) and three sites outside the Pampas. Specifically, we used the model developed by McCall & Bishop-Hurley (2003), adapted and calibrated for lucerne in Argentina by Berone et al. (2017) to estimate the potential yield (PY) for 12 locations (three irrigated and nine rainfed), and compared those results with measured yields from the NLCEN to calculate yield gaps. We found the average available photosynthetic active radiation (PAR) and temperatures were sufficient to achieve 21.5 ± 3.7 t dry matter (DM) ha À1 yr À1 under rainfed conditions (environments with mean annual rainfall from 400 to 1,200 mm). However, the average measured yield from the NLCEN was 16.8 ± 2.4 t DM ha À1 yr À1 (a 22% gap). Potential yields ranged between 10 and 25 t DM ha À1 yr À1 under rainfed conditions and between 25 and 39 t DM ha À1 yr À1 for irrigated crops. As latitude increased rainfed locations had lower yields, while irrigated locations had higher yields. Adding irrigation was predicted to increase yields to 35.4 ± 2.0 t DM ha À1 yr À1 (a 53% gap) in rainfed sites. For irrigated locations, the gap was smaller (27.3 ± 3.5 vs 32.4 ± 2.2 t DM ha À1 yr À1 for measured vs potential yield, respectively), and most likely linked to nutrient deficits. Also, current grazing management was estimated to achieve approximately 50% less grazing efficiency than optimal grazing management. Our results demonstrated that the livestock industry can potentially increase animal production under current environmental conditions. The four main adjustments to achieve this are increased use of irrigation, increased use of fertilisers, earlier commencement of grazing in spring and increased stocking rates.

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Section: Resultsmentioning

confidence: 99%

Yield gaps of lucerne (Medicago sativa L.) in livestock systems of Argentina

Jáuregui

Ojeda²,

Berone

et al. 2022

Annals of Applied Biology

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“…The relative accuracy of different soil test methods for P availability varies with soil types and P management conditions (8) . Among the dilute strong acid extractants, the Bray I method (9) has been widely adopted mostly for acid-neutral soils of both North and South America that are fertilized with soluble P sources (10) (11) . Phosphorus sink-based tests, such as anion-cation exchange resins, were predictors of response to P for a variety of soil conditions (12) and for pastures fertilized with sparingly soluble P fertilizers (13) .…”

Section: Introductionmentioning

confidence: 99%

Soil sampling depth and phosphorus extraction method for phosphorus in leguminous pastures

Cuadro,

Cadenazzi,

Quincke

2022

Agrocienc Urug

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The current guidelines and recommendations for P fertilization in Uruguay can be improved by adjusting the sampling depth and analytical methods of testing soil P in pastures with different fertilization history. A set of field trials was conducted between 2008 and 2012 on 14 sites of Uruguay for the purpose of comparing two sampling depths and three methods for assessing P availability by their correlation with annual dry matter yield response. The trials had a randomized complete block design and were sown with Trifolium repens or Lotus corniculatus. Soil P availability was determined by sampling 0-7.5 and 0-15 cm depth using three analytical methods: Bray I, cationic resins, and citric acid. Rock phosphate and triple superphosphate were applied at five P rates. (0-240 kg kg P2O5 ha-1). Annual forage yield was recorded. Relative yield was calculated as measured yield/maximum yield observed within a block. The correlation between relative yield and soil P availability was studied using the modified arcsine-logarithm calibration curve (ALCC) and analyzing the resulting correlation coefficient, root-mean-square error (RMSE) of the soil P test, and RMSE of the relative yield. The 0-7.5 cm soil sampling depth did not show a better fit than the deeper sampling (0-15 cm), with the latter having less variation in soil P test values. When rock phosphate was used, the correlation coefficients were 0.50 for cationic resins, 0.53 for citric acid, and 0.38 for Bray I. When triple superphosphate was used, the correlation coefficients were 0.37 for cationic resins, 0.44 for citric acid and 0.43 for Bray I. For both P sources, the citric acid method with the sampling of 0-15 cm soil depth is the preferred soil P test method for management of P in leguminous pastures for the soils studied.

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Diagnóstico de requerimiento de fósforo para alfalfa (Medicago sativa L.) en argiudoles

Cited by 2 publications

References 17 publications

Yield gaps of lucerne (Medicago sativa L.) in livestock systems of Argentina

Yield gaps of lucerne (Medicago sativa L.) in livestock systems of Argentina

Soil sampling depth and phosphorus extraction method for phosphorus in leguminous pastures

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