NDLI: Evaluation of residual and cumulative phosphorus effects in contrasted Moroccan calcareous soils

Content Provider	Springer Nature Link
Author	Amrani, M. Westfall, D.G. Moughli, L.
Copyright Year	1999
Abstract	Consideration of factors affecting the availability of applied P in soils could improve P fertilization recommendations. Little information is available on the effects of continuous P fertilizer applications under cropping systems in Morocco. A greenhouse study was conducted to evaluate the residual and cumulative P effects on three succeeding crops, wheat ( Triticum aestivum L.)-corn (Zea maize)-wheat, in contrasting calcareous soils from the arid and semiarid zones of Morocco. The treatments were the amount (0, 3.4, 6.7, or 13.4 mg P kg-1 soil) and time of application of P. The residual P effects on grain yield, dry-matter production, and total P uptake were significant. In this study, the increase in yields as a function of applied P was explained by the model: Y = a + b*(Pad)0.5. The increase rate (constant b in the model) of dry-matter production of corn ranged from 0.56 (soil 10) to 2.89 (soil 11). At the same P fertilizer rate, single applications yielded less grain production than repeated applications. These results showed that if we want to take residual P into consideration in P fertilizer recommendations, the critical soil test P level should be lower than the one normally determined by soil test calibration method. Also, soils with low initial NaHCO3-P levels had the lowest residual value, inferring that a large portion of added P is fixed in these soils. This study showed that a significant response of corn to residual P would occur in soils with initial NaHCO3-P test levels less than 6 mg P kg-1. The response would be inconsistent between 9 and 14 mg P kg-1, and no response is expected above a soil test P level of 14 mg P kg-1. In general, soils with more than 14 mg kg-1 NaHCO3-P could provide adequate P for maximum yield for three succeeding crops under greenhouse conditions.
Starting Page	231
Ending Page	238
Page Count	8
File Format	PDF
ISSN	13851314
Journal	Nutrient Cycling in Agroecosystems
Volume Number	55
Issue Number	3
e-ISSN	15730867
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science

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