| Texto completo | |
| Autor(es): |
Borghi, Emerson
[1]
;
Costa Crusciol, Carlos Alexandre
[2]
;
Ocheuze Trivelin, Paulo Cesar
[3]
;
Nascente, Adriano Stephan
[4]
;
Costa, Ciniro
[5]
;
Mateus, Gustavo Pavan
[6]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Brazilian Agr Res Corp, EMBRAPA, Maize & Sorghum Res Ctr, BR-35701970 Sete Lagoas, MG - Brazil
[2] Sao Paulo State Univ, UNESP, Coll Agr Sci FCA, Dept Crop Sci, BR-18610307 Botucatu, SP - Brazil
[3] Univ Sao Paulo, Ctr Nucl Energy Agr CENA, BR-13400970 Piracicaba, SP - Brazil
[4] EMBRAPA, Rice & Beans Res Center, BR-75375000 Antonio De Goids, Go - Brazil
[5] UNESP, Coll Vet Med & Anim Sci, Dept Anim Nutr & Breeding, BR-18618970 Botucatu, SP - Brazil
[6] Sao Paulo Agcy Agribusiness Technol APTA, BR-16900970 Botucatu, SP - Brazil
Número total de Afiliações: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Revista Brasileira de Ciência do Solo; v. 38, n. 5, p. 1457-1468, SEP-OCT 2014. |
| Citações Web of Science: | 4 |
| Resumo | |
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 ((NH4NO3)-N-15) 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, Sao 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 ((NH4NO3)-N-15) 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) | |
| Processo FAPESP: | 03/09914-3 - Sistemas de produção agrícola em semeadura direta |
| Beneficiário: | Ciro Antonio Rosolem |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa PRONEX - Temático |