02339naa a2200241 a 450000100080000000500110000800800410001902400330006010000180009324501210011126000090023252016340024165000140187565000100188970000230189970000170192270000150193970000140195470000200196870000250198870000210201377300630203420596572017-03-02       2016    bl uuuu     u00u1 u    #d7 a10.2134/agronj2015.02362DOI1 aMATEUS, G. P.  aSidedress nitrogen application rates to sorghum intercropped with tropical perennial grasses.h[electronic resource]  c2016  aIntercropping 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. Mombaça; 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 $60 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.  aGramínea  aSorgo1 aCRUSCIOL, C. A. C.1 aPARIZ, C. M.1 aBORGHI, E.1 aCOSTA, C.1 aMARTELLO, J. M.1 aFRANZLUEBBERS, A. J.1 aCASTILHOS, A. M.  tAgronomy Journal, Madisongv. 108, n. 1, p. 433-447, 2016.