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| Title: | Ultra-high plant populations and nitrogen fertility effects on corn in the Mississippi Valley. |
| Authors: | Bruns, H.A.
Abbas, H.K.
USDA, ARS |
| Keywords: | seed weight
Zea mays
corn
grain crops
plant density
nitrogen
soil fertility
nutrient availability
plant growth
grain yield
yield components
fertilizer rates
nitrogen fertilizers
application timing
Mississippi |
| Issue Date: | 17-Oct-2007 |
| Description: | Populations for high yield and low mycotoxin levels in furrow-irrigated corn (Zea mays L.) have yet to be firmly established for the Midsouth USA. Preplant N applications compared with a split application and the effects on yield, yield components, and mycotoxin levels were also examined. Experiments were conducted at Site WR (102-cm-wide rows, Beulah fine sandy loam) and Site NR (76-cm-wide rows, Dundee silty clay). Plant densities of 71 760, 82 160, 92 560, and 102 960 plants ha(-1) were grown in eight-row plots, 9.1 m long at both sites. The N fertility treatments were 112 kg N ha(-1) preplant, 224 kg N ha(-1) preplant, and 112 kg N ha(-1) preplant + 112 kg N ha(-1) sidedressed at V6 (six leaves). Yields at Site WR did not differ among populations. Maximum yields at Site NR were at 71 760 plants ha(-1) (10.3 Mg ha(-1)) and then declined (b = -0.5065). Kernels per ear declined (b = -40.09 and b = -42.69), kernel weights declined (b = -0.4328 and b = -0.8172), and stalk lodging increased (b = 0.0103 and b = 0.0251) with increased populations for Sites WR and NR, respectively. These and previous data place the maximum population for corn in the Midsouth at about 70 000 plants ha(-1). No differences in yield occurred between the 224 kg N ha(-1) preplant treatment and the split application of N. Yields were generally less with 112 kg N ha(-1) per-plant only. Aflatoxin and fumonisin levels at both sites were unaffected by plant population of N fertility. |
| URI: | http://seekspace.resip.ac.cn/handle/2239/32067 |
| Other Identifiers: | http://seekspace.resip.ac.cn/handle/10113/3702 |
| Appears in Collections: | 网络开放学术资源
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