ISHS Acta Horticulturae 448: III International Symposium on Mineral Nutrition of Deciduous Fruit Trees
DISTRIBUTION OF SOIL P AND K AS AFFECTED BY NP- FERTIGATION IN HIGH DENSITY APPLE ORCHARDS |
| Authors: | G.H. Neilsen, P. Parchomchuk, D. Neilsen |
| Keywords: | fertigation rate and schedule, drip, microjet, irrigation, apple, soil |
| Abstract:
Extractable soil P and K were monitored for three years at different depths and distances from irrigation emitters undergoing NP-fertigation in three different experimental high density apple plantings on loamy sand soils. Single dose application of P resulted in higher soil P compared to multiple applications of the same amount of P although such differences varied with distance and depth, declined after first year and were not measurable at more than 60 cm from the emitter source. Extractable soil P increased with rate of fertigated-P and with drip-relative to microjet-fertigation. NP fertigation also reduced extractable soil K values over time with near deficient values measured near the emitter and soil surface by third year. Apple trees were more responsive to the changes in soil K than soil P status. | |
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