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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sidedress Nitrogen Application Rates to Sorghum lntercropped with Tropical Perennial Grasses

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Author(s):
Mateus, G. P. [1] ; Crusciol, C. A. C. [2] ; Pariz, C. M. [3] ; Borghi, E. [4, 5] ; Costa, C. [3] ; Martello, J. M. [2] ; Franzluebbers, A. J. [6] ; Castilhos, A. M. [3]
Total Authors: 8
Affiliation:
[1] Sao Paulo Agcy Agribusiness Technol APTA, Andradina, SP - Brazil
[2] UNESP, Coll Agr Sci, Dept Crop Sci, Botucatu, SP - Brazil
[3] UNESP, Sch Vet Med & Anim Sci, Dept Anim Nutr & Breeding, Botucatu, SP - Brazil
[4] UNESP, Coll Agr Sci, Botucatu, SP - Brazil
[5] Brazilian Agr Res Corp EM BRA PA, Corn & Sorghum Res Ctr, Sete Lagoas, MG - Brazil
[6] N Carolina State Univ, USDA ARS, 3218 Williams Hall, Campus Box 7619, Raleigh, NC 27695 - USA
Total Affiliations: 6
Document type: Journal article
Source: AGRONOMY JOURNAL; v. 108, n. 1, p. 433-447, JAN-FEB 2016.
Web of Science Citations: 13
Abstract

Intercropping sorghum {[}Sorghum bicolor (L.) Moench] with tropical perennial grasses and using the appropriate rate of sidedress N application can maximize grain yield (GY) and revenue and can improve land-use efficiency (LUE). The effects of monocropped sorghum (MS) or sorghum intercropped with palisadegrass (Urochloa brizantha cv. Marandu; SPG) or guineagrass (Panicum maximum cv. Mombasa; SGG) and sidedress N application rates of 0, 50, 100, and 200 kg ha(-1) on leaf nutrient concentration, sorghum GY, revenue, and LUE were investigated during three growing seasons at Botucatu, SP, Brazil, on a clay, kaolinitic, thermic Typic Haplorthox. The SGG treatment had lower leaf N, P, and K concentrations and lower 1000-grain weight, shoot dry matter, and GY than MS and SPG at all sidedress N rates; MS and SPG at 200 kg ha-1 of sidedress N resulted in greater sorghum GYs (3.80 and 3.81 Mg ha-1, respectively). The forage dry matter production (FDMP) and crude protein of tropical perennial grasses were higher as a function of the sidedress N rate. The SGG treatment resulted in negative net profits for all sidedress N rates. The MS and SPG treatments (independent of sidedress N rates) resulted in similar net profits (approximately US\$85 and 560 ha(-1), respectively). The SPG treatment using 200 kg ha-1 of sidedress N resulted in a higher land equivalent ratio and relative N yield (1.27 and 123%, respectively) than SGG (0.96 and 107%, respectively). The SPG treatment with 200 kg ha(-1) of sidedress N is the best option for increasing sorghum GY, revenue, and FDMP from autumn to part of the spring and for improving LUE. (AU)

FAPESP's process: 03/09914-3 - Direct sowing system of agricultural production
Grantee:Ciro Antonio Rosolem
Support type: PRONEX Research - Thematic Grants