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Details for article 11 of 14 found articles
| Title: |
Potassium fertilization of cotton on two high testing soils under two tillage systems |
| Author: |
Howard, D. D. Gwathmey, C. O. Roberts, R. K. Lessman, G. M. |
| Appeared in: |
Journal of plant nutrition |
| Paging: | Volume 20 (1997) nr. 12 pages 1645-1656 |
| Year: |
1997-12 |
| Contents: |
Potassium (K) fertilization of cotton (Gossypium hirsutum L.) has been a major research focus the last few years throughout the cotton belt. The objective of this field research, conducted from 1991 through 1994 on two high Mehlich I extractable K (EK) soils, was to evaluate broadcast and foliar applied K for conventional- (CT) and no-tillage (NT) production. Main plot broadcast K rates were 0, 28, 56, and 112 kg K ha-1. Foliar sub-plot treatments were a non-foliar check, KNO3, and Ca(NO3)2. The KNO3 was applied four times per year at 4.1 kg K ha-1 application-1. Calcium nitrate was applied at 1.6 kg N ha-1 to equal the N applied in the KNO3. Extractable K increased annually with broadcast K for both tillage systems and soils and was higher for NT than CT. Lint yields from CT of both soils were increased two of the eight site-years while yields from NT were increased five of eight site-years by broadcast K. Three of the NT site-year yields plus four-year mean yields of both soils were increased by applying 56 kg K ha-1, a rate higher than currently recommended for high EK soils. Yield responses to foliar fertilization were from added N rather than the K. Petiole K levels were sufficient so that extra K applied foliarly was not recommended for either soil or tillage system. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 11 of 14 found articles
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