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Root growth and yield of peanut cultivars affected by phosphorus management

Grant number: 20/14810-8
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): October 01, 2021
Field of knowledge:Agronomical Sciences - Agronomy - Crop Science
Principal Investigator:Ciro Antonio Rosolem
Grantee:Carlos Felipe dos Santos Cordeiro
Host Institution: Faculdade de Ciências Agronômicas (FCA). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil
Associated scholarship(s):23/06072-5 - Soil P dynamics and availability under P efficient and non-efficient peanut cultivars, BE.EP.DR


Peanuts are grown mainly in sandy soils with low phosphorus availability, although there may be non-labile phosphorus due to previous fertilization. There are reports that peanuts are efficient in absorbing P in less labile ways. On the other hand, currently the cultivars are more productive than those of the past, so that fertilization has been carried out empirically, with the need to establish more adequate rates of P, based on a better understanding of the plant's strategies for acquiring P. Objectives will be to evaluate root growth, microbiology and the forms of P soil, physiological activity and yield of modern peanut cultivars depending on the availability of P. A greenhouse study will be carried out with seven cultivars grown in soils with low and high availability of P. Root hairs, root growth, dry matter yield, P absorption, microbiology and P fractionation in the rhizosphere will be evaluated. A second study will be carried out in the field for two crops, with two cultivars selected in study 1 and rates of P2O5. Two experiments will be conducted simultaneously, one on degraded pasture with low P content, and the other after peanut, with adequate content. Fractionation of P, accumulation of dry matter and P in the plant, leaf diagnosis and root growth will be done. The yield components, yield, extraction and export of nutrients will be evaluated. After harvesting, soil will be collected at depths of 0-10, 10-20, 20-40, 40-60 and 60-80 cm for fractionation of P. In the third study, the physiological activity of peanuts will be evaluated according to the management of the peanut phosphorus. (AU)

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