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Details van artikel 75 van 183 gevonden artikelen
| Titel: |
Effects of fertilization and irrigation on corn yields, p content of corn leaves, and available p in soil |
| Auteur: |
Lutz, J. A. Jones, G. D. Hoepner, P. H. Porter, H. C. Martens, D. C. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 2 (1971) nr. 6 pagina's 449-460 |
| Jaar: |
1971 |
| Inhoud: |
Experiments were conducted on Congaree loam at Orange, Virginia, in 1963, 1964, and 1965 to measure the response of corn to irrigation and to 3 levels of P. Rate of N was 140 kg/ha. Levels of P were 0, 37.5, and 75 kg/ha; while the rate of K. was 70 kg/ha. All micronutrients were applied in recommended amounts. Excellent corn silage and grain yields were obtained and there was no response to added V except for grain yields on irrigated plots. Cropping with corn, irrigation, and fertilization appeared to have little effect on the P content of the 0- to 15-cm soil layer. Irrigation and P fertilization did not affect the P content of the corn leaves. Fractionation of P indicated appreciable amounts of A1-P, Fe-P, and Ca-P to a depth of 140 cm with less Al-P than the other forms. Moisture extraction by the corn, as measured with Bouyoucos blocks, indicated that the corn was utilizing moisture to a depth of 120 cm during silking and tasseling. The corn roots, therefore, had access to appreciable amounts of P below the 0- to 15-cm soil depth. Since there was essentially no change in the P content of the 0- to 15-cm soil depth, the corn apparently was either utilizing most of its P from soil depths below 15 cm, or available P was being maintained at a fairly constant amount from the various forms in which it was found in the soil. This is in contrast to the usual situation in which plants utilize appreciable amounts of P from, the 0- to 15-cm soil depth. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 75 van 183 gevonden artikelen
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