TY - JOUR
T1 - Grain sorghum response to nitrogen fertilizer following cover crops
AU - Preza Fontes, Giovani
AU - Tomlinson, Peter J.
AU - Roozeboom, Kraig L.
AU - Ruiz Diaz, Dorivar A.
N1 - Funding Information:
This research was partially supported by the Kansas Fertilizer Research Fund, the Agronomic Science Foundation-Sustainable Research Program, and the Kansas Agricultural Experiment Station. The authors thank the graduate and undergraduate students who were part of our research programs for their contributions during field and laboratory work.
Publisher Copyright:
© 2017 American Society of Agronomy.
PY - 2017/11/1
Y1 - 2017/11/1
N2 - Cover crops (CCs) can affect N fertilizer management by influencing nutrient cycling and N fertilizer requirement. Cropping systems with different CCs were established in 2007 to examine the response of sorghum [Sorghum bicolor (L.) Moench]. Four CC treatments {summer legume, late-maturing soybean [LMS; Glycine max (L.) Merr]; summer non-legume, sorghum–sudangrass (SS; Sorghum bicolor × Sorghum bicolor var. sudanese); winter legume, crimson clover (CL; Trifolium incarnatum L.), and winter non-legume, daikon radish (DR; Raphanus sativus L.)} as well as double-crop soybean (DSB) and chemical-fallow (CF) treatments were imposed after wheat (Triticum aestivum L.) harvest in a wheat–sorghum–soybean cropping system. Five N rates (0, 45, 90, 135, and 180 kg N ha–1) were applied to sorghum within 2 wk of planting. Aboveground sorghum biomass was collected after physiological maturity to determine total N uptake and grain yield. The cropping system managed with LMS increased grain yield (>9%), compared to other CCs and CF with zero N application. Cropping systems including CL, DR, and DSB had similar effects on grain yield relative to CF when N fertilizer was applied. Increasing N rates significantly increased grain yield and N uptake of grain sorghum following SS, indicating that soil N was limited in this cropping system. The addition of LMS as a summer legume CC has the potential to contribute N and replace CF, thus improving management of N resources.
AB - Cover crops (CCs) can affect N fertilizer management by influencing nutrient cycling and N fertilizer requirement. Cropping systems with different CCs were established in 2007 to examine the response of sorghum [Sorghum bicolor (L.) Moench]. Four CC treatments {summer legume, late-maturing soybean [LMS; Glycine max (L.) Merr]; summer non-legume, sorghum–sudangrass (SS; Sorghum bicolor × Sorghum bicolor var. sudanese); winter legume, crimson clover (CL; Trifolium incarnatum L.), and winter non-legume, daikon radish (DR; Raphanus sativus L.)} as well as double-crop soybean (DSB) and chemical-fallow (CF) treatments were imposed after wheat (Triticum aestivum L.) harvest in a wheat–sorghum–soybean cropping system. Five N rates (0, 45, 90, 135, and 180 kg N ha–1) were applied to sorghum within 2 wk of planting. Aboveground sorghum biomass was collected after physiological maturity to determine total N uptake and grain yield. The cropping system managed with LMS increased grain yield (>9%), compared to other CCs and CF with zero N application. Cropping systems including CL, DR, and DSB had similar effects on grain yield relative to CF when N fertilizer was applied. Increasing N rates significantly increased grain yield and N uptake of grain sorghum following SS, indicating that soil N was limited in this cropping system. The addition of LMS as a summer legume CC has the potential to contribute N and replace CF, thus improving management of N resources.
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U2 - 10.2134/agronj2017.03.0180
DO - 10.2134/agronj2017.03.0180
M3 - Article
AN - SCOPUS:85034109590
SN - 0002-1962
VL - 109
SP - 2723
EP - 2737
JO - Agronomy Journal
JF - Agronomy Journal
IS - 6
ER -