Significance of Phosphorus for Agriculture and the Environment in the West Asia and North Africa Region

Ryan, John; Ibrikçi, H.; Delgado, Antonio; Torrent, J.; Sommer, Rolf; Rashid, Abdul

doi:10.1016/b978-0-12-394275-3.00004-3

Cited by 49 publications

(36 citation statements)

References 180 publications

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“…Sometimes the use of chemical products has been carried out without agronomic justification, leading to the appearance of environmental problems, such as the eutrophication of inland waters [142] and the loss of biodiversity [143,144]. In the more economically developed countries such as U.S., European countries, and more recently in China, where there has been a great intensification of agriculture during the last decades, P content in the soil is mainly an environmental problem [145].…”

Section: Effect Of P On Fe Nutrition and Vice Versamentioning

confidence: 99%

Similarities and Differences in the Acquisition of Fe and P by Dicot Plants

et al. 2018

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This review deals with two essential plant mineral nutrients, iron (Fe) and phosphorus (P); the acquisition of both has important environmental and economic implications. Both elements are abundant in soils but are scarcely available to plants. To prevent deficiency, dicot plants develop physiological and morphological responses in their roots to specifically acquire Fe or P. Hormones and signalling substances, like ethylene, auxin and nitric oxide (NO), are involved in the activation of nutrient-deficiency responses. The existence of common inducers suggests that they must act in conjunction with nutrient-specific signals in order to develop nutrient-specific deficiency responses. There is evidence suggesting that P-or Fe-related phloem signals could interact with ethylene and NO to confer specificity to the responses to Fe-or P-deficiency, avoiding their induction when ethylene and NO increase due to other nutrient deficiency or stress. The mechanisms responsible for such interaction are not clearly determined, and thus, the regulatory networks that allow or prevent cross talk between P and Fe deficiency responses remain obscure. Here, fragmented information is drawn together to provide a clearer overview of the mechanisms and molecular players involved in the regulation of the responses to Fe or P deficiency and their interactions.

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Section: Effect Of P On Fe Nutrition and Vice Versamentioning

confidence: 99%

Similarities and Differences in the Acquisition of Fe and P by Dicot Plants

et al. 2018

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“…Phosphorus is limited in most Asian and African soils [71]. One of the major constraints related to soil P is its low availability for plant uptake [72].…”

Section: Phosphorus Managementmentioning

confidence: 99%

A Review of Nutrient Management Studies Involving Finger Millet in the Semi-Arid Tropics of Asia and Africa

Thilakarathna

Raizada

2015

Agronomy

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Finger millet (Eleusine coracana (L.) Gaertn) is a staple food crop grown by subsistence farmers in the semi-arid tropics of South Asia and Africa. It remains highly valued by traditional farmers as it is nutritious, drought tolerant, short duration, and requires low inputs. Its continued propagation may help vulnerable farmers mitigate climate change. Unfortunately, the land area cultivated with this crop has decreased, displaced by maize and rice. Reversing this trend will involve achieving higher yields, including through improvements in crop nutrition. The objective of this paper is to comprehensively review the literature concerning yield responses of finger millet to inorganic fertilizers (macronutrients and micronutrients), farmyard manure (FYM), green manures, organic by-products, and biofertilizers. The review also describes the impact of these inputs on soils, as well as the impact of diverse cropping systems and finger millet varieties, on nutrient responses. The review critically evaluates the benefits and challenges associated with integrated nutrient management, appreciating that most finger millet farmers are economically poor and primarily use farmyard manure. We conclude by identifying research gaps related to nutrient management in finger millet, and provide recommendations to increase the yield and sustainability of this crop as a guide for subsistence farmers. OPEN ACCESSAgronomy 2015, 5 263

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“…Limited known reserves and increased demand to match rising food needs of a growing World population make feasible future scarcity and rising prices of this commodity (Cordell et al 2009;Keyzer 2010;Van Vuuren et al 2010;Ryan et al 2012). This future P scarcity is emerging as one of the key global environmental challenges (Cordell and Neset 2014).…”

Section: Introductionmentioning

confidence: 99%

“…More than 80 % of mined phosphate rock is used in fertilizer industry (Cordell et al 2009;Ryan et al 2012), and it is well known that only a fraction of applied P remains available to crops (Delgado et al 2002;Delgado and Scalenghe 2008). More efficient use of P in agriculture requires more accurate P fertilizer recommendations, which should rely on accurate estimation of the phytoavailable P in soil.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Recena

Torrent

Campillo

et al. 2015

Agron. Sustain. Dev.

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Efficient use of phosphorus (P) by plants in agriculture relies on accurate estimation of the phytoavailable soil P. However, poor relationships are frequently observed between P availability indices, such as Olsen P, and P uptake by plants. We therefore studied which soil properties modify the accuracy of Olsen P as a P availability index. We conducted a soil P depletion experiment in pots with 17 soils. Two samples differing widely in Olsen P were used for each soil and named "low-P" and "high-P." Soil was mixed with siliceous sand to achieve 1 mg of Olsen P per pot, so that the ratio of non-readily available P, either inorganic P or organic P, to Olsen P in the pot was higher for low-P than for high-P samples. Results show that, in high-P samples, P uptake by cucumber is positively correlated with the affinity of the soil solid phase for P, with R 2 of 0.76. In high-P samples, P uptake by cucumber is positively correlated with total P adsorption capacity as estimated by Fe in the form of Fe oxides, with R 2 = 0.56. P uptake is positively correlated with the inorganic P released by NaOH and citrate-bicarbonate in low-P samples, with R 2 of 0.52. In low-P samples, total organic P and phosphatase activity in the rhizosphere explained 37 % of plant P uptake. In low-P samples, phosphatase activity and pH explained 50 % of plant P uptake. These findings reveal that organic P forms and hydrolytic activity by roots are explaining P availability to plants. Whereas physico-chemical processes controlling inorganic P dynamics play a major role for low organic P/Olsen P ratios.

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Significance of Phosphorus for Agriculture and the Environment in the West Asia and North Africa Region

Cited by 49 publications

References 180 publications

Similarities and Differences in the Acquisition of Fe and P by Dicot Plants

Similarities and Differences in the Acquisition of Fe and P by Dicot Plants

A Review of Nutrient Management Studies Involving Finger Millet in the Semi-Arid Tropics of Asia and Africa

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

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