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| Titel: |
Effects of irrigation and fertilization on yields and chemical composition of corn and on the changes in the available K contents of a Cecil soil |
| Auteur: |
Lutz, J. A. Rich, C. I. Hale, E. B. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 3 (1972) nr. 3 pagina's 231-242 |
| Jaar: |
1972 |
| Inhoud: |
Corn (Zea mays L.) was grown for five consecutive years on Cecil fine sandy loam to measure the effects of irrigation and fertilization on leaf composition, yields, and on the changes in available K in the soil. Plant nutrients consisting of 0, 56, 140, 224 and 280 kg N/ha: 0, 15, 37.5, 60 and 75 kg P/ha, and 0, 28, 70, 112 and 140 kg K/ha were applied in a central composite rotatable design in each of the five years. All plant residue was removed each year when the corn was harvested and the plots were seeded without fertilization to rye each year as a cover crop. One-half of the experiment was irrigated when there was a 50% depletion of available soil moisture in the 0- to 45-cm soil depth. The available K content of the 0- to 15-cm soil depth was not significantly affected by irrigation but decreased with cropping at all rates of applied K. Decreases in available K were less pronounced with increased rates of applied K. The available K content of the 90- to 120-cm depth was similar where 0 and 140 kg K/ha were applied. Irrigation, as compared with no irrigation, decreased the level of available K throughout the profile on uncropped and unfertilized plots. Irrigation increased the N content of corn leaves but did not increase the P and K contents. Corn responded to N during the last four years, to K only in the fifth year and there was no response to P fertilization. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 12 gevonden artikelen
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