PHOSPHORUS AND POTASSIUM FERTILIZATION OF TANGOR `Murcott'
Abstract
Tangor 'Murcott' (Citrus sinensis x Citrus reticulata)is a low foliage plant, highly. yielding, thus being subjected to exhaustion which may cause plant death. Potassium deficiency is pointed out as accounting for this exhaustion. On the other hand, citrus response to phosphate fertilization is contradictory, as well as the indication for deep application of phosphorus into the sofi. To evaluate the effect of different leveis of K fertilizer and P depth of application before seeding, an experiment was carriecl out at the Agronomic Experimental Station of Federal University of Rio Grande do Sul, located in Eldorado do Sul, Southem Brazil (30° 06' S; 51° 39' W). Tangor 'Murcott', grafted on 'Caipira' orange (Citrus sinensis) and planted on a Paleudult sofi, was studied from 1980 to 1987. The treatments consisted of three leveis of K fertilizer and three ways of P incorporation into the sofi, both before seeding. Results showed that P increased the number and the average weight of the fruits produced, specially when incorporated at the surface. There was no difference for the depth of P application. The highest leve) of K fertilizer increased the average weight of the fruits.
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