| Full text | |
| Author(s): |
Emerson Borghi
[1]
;
Carlos Alexandre Costa Crusciol
[2]
;
Paulo Cesar Ocheuze Trivelin
[3]
;
Adriano Stephan Nascente
[4]
;
Ciniro Costa
[5]
;
Gustavo Pavan Mateus
[6]
Total Authors: 6
|
| Affiliation: | [1] Brazilian Agricultural Research Corporation. Maize and Sorghum Research Center - Brasil
[2] Sao Paulo State University. College of Agricultural Sciences. Department of Crop Science - Brasil
[3] University of São Paulo. Center for Nuclear Energy in Agriculture - Brasil
[4] EMBRAPA. Rice and Beans Research Center - Brasil
[5] UNESP. College of Veterinary Medicine and Animal Science. Department of Animal Nutrition and Breeding - Brasil
[6] São Paulo Agency of Agribusiness Technology - Brasil
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | Revista Brasileira de Ciência do Solo; v. 38, n. 5, p. 1457-1468, 2014-10-00. |
| Abstract | |
Nitrogen is required in large amounts by plants and their dinamics in corn and perennial forages intercropped is little known. This study analyzed the efficiency of nitrogen fertilization (15NH4NO3) applied after corn grain harvest to palisadegrass (Brachiaria brizantha cv. Marandu) in intercrops sown at two times, as well as the N residual effect on the subsequent corn crop. The field experiment was performed in Botucatu, São Paulo State, in southeastern Brazil, on a structured Alfisol under no-tillage. The experiment was arranged in a randomized block design in a split plot scheme with four replications. The main plots consisted of two intercropping systems (corn and palisadegrass sown together and palisadegrass sown later, at corn top-dressing fertilization). The subplots consisted of four N rates (0, 30, 60, and 120 kg ha-1 N). The subplots contained microplots, in which enriched ammonium nitrate (15NH4NO3) was applied at the same rates. The time of intercrop sowing affected forage dry matter production, the amount of fertilizer-derived N in and the N use efficiency by the forage plants. Nitrogen applied in autumn to palisadegrass intercropped with corn, planted either at corn sowing or at N top-dressing fertilization, increased the forage yield up to a rate of 60 kg ha-1. The amount of fertilizer-derived N by the forage plants and the fertilizer use efficiency by palisadegrass were highest 160 days after fertilization for both intercrop sowing times, regardless of N rates. Residual N did not affect the N nutrition of corn plants grown in succession to palisadegrass, but increased grain yield at rates of 60 and 120 kg ha-1 N, when corn was grown on palisadegrass straw from the intercrop installed at corn fertilization (top-dressing). Our results indicated that the earlier intercropping allowed higher forage dry matter production. On the other hand, the later intercrop allowed a higher corn grain yield in succession to N-fertilized palisadegrass. (AU) | |
| FAPESP's process: | 03/09914-3 - Direct sowing system of agricultural production |
| Grantee: | Ciro Antonio Rosolem |
| Support Opportunities: | PRONEX Research - Thematic Grants |