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Accueil du site → Doctorat → États-Unis → 1997 → Improvement of soil test P calibration and fertilizer P management in crop rotations in Moroccan dryland agriculture.

Colorado State University (1997)

Improvement of soil test P calibration and fertilizer P management in crop rotations in Moroccan dryland agriculture.

Amrani, Mohamed

Titre : Improvement of soil test P calibration and fertilizer P management in crop rotations in Moroccan dryland agriculture.

Auteur : Amrani, Mohamed

Université de soutenance : Colorado State University

Grade : Doctor of Philosophy (PhD) 1997

Description
The response of wheat and chickpea to direct, residual, and cumulative fertilizer P application in calcareous soils of dryland Moroccan zones was investigated at three locations. Cumulative.Prates of two annual application .of 8.9, 17.8, and 26.7 kg P ha-1 each resulted in increasing NaHC03-P level by about 1.8, 3.5, and 5.5 mg P kg-1, respectively, at the end of 1995-96 growing season. However, the-increase in NaHC03..:p nroduced by a singl application of the three above rates tothe first crop were 0.4, l.O, and 2.0 mg P kg-1•
At.low soil test P levels, high amounts of fertilizer were needed to increase soil NaHC03-P in soil to a sufficient level. In our study, the amounts needed to maintain the NaHC03-P level above the critical level during two years were 8.9. 17.8. and 53.4’kg P ha-1 at Khmis Zemamra. Sidi El Aydi, and Khmis Sidi Rhhal, respectively. In fact, an annual application of 17 .8 kg P ha-1 was sufficient to maintain the yields of wheat and chickpea near the optimum level for the entire rotation.
The NaHC03-P levels were not affected by cropping system or crop. Therefore, the P availability is mainly governed by soil factors rather than-crop. The data reported in this study lead to the conclusion that residual effects. of P fertilizer are governed by the amount of P application, time, and initial soil test P level. While the residual effects of P was evident. thev are not adequate to maximize yields of wheat or chiekpea.

Mots Clés : Soils – Phosphorus content – Morocco ; Arid regions agriculture – Morocco ; Soils – Testing

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