Effect of nitrogen sources on nutrient uptake and grain yield of durum wheat under Tunisian rainfed conditions
1988
Gharbi, A. | Boubakri, B. (Kef Higher School of Articulture, Kef (Tunisia))
The study was based on a fertilizer field trial setup under semi-arid conditions. Four rates of nitrogen were supplied from three different forms: ammonium nitrate, diammonium phosphate, and urea. Results showed that all nitrogen sources reduced the soil pH; increased the phosphorus, nitrogen and potassium levels in the soil; enhanced nitrogen, phosphorus and potassium uptake by plants; and finally increased the grain yield levels of durum wheat. The supply of increasing amounts of nitrogen engendered an increase in P and K levels in soils, as well as an increase in N, P and K in plant leaves, regardless of the form of the nitrogen applied. Ammonium nitrate led to the least soil pH decrease, however it gave the highest nitrogen and potassium uptake level as well as the highest grain yields recorded. Diammonium phosphate was shown to be the most acidifying nitrogen form. It engendered the highest soil and plant P levels but the lowest grain yield
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