Effect of Phosphorus and Nitrogen Placement on Safflower Growth and Phosphorus Absorption1
- C. H. E. Werkhoven and
- F. Massantini2
The effect of N and P placement on safflower growth and fertilizer P absorption was studied in the greenhouse. One level of N, 112 kg/ha, as NHaNOa, and three levels of P32-labeled P, viz., 0, 28, and 56 kg P per ha, as Ca(H2PO4)2- H2O, were used. The placements included banding N and P together 2.5 cm below the seed, broadcasting both elements, banding P with the N broadcast, and banding N with the P broadcast. The amount of fertilizer P absorbed and plant heights were measured weekly and the percentages of total plant P and fertilizer-derived P, as well as the dry matter yield, were determined at the conclusion of the trial. In general, banding of P was more- efftcient than -broadcasting. Banding 28 kg P per ha was as effective as broadcasting twice that amount. The placement of N was less important than the placement of P. Placement treatments did not affect the total P concentration in the plants.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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