科研之友
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摘要
Sorghum [Sorghum bicolor (L.) Moench] can be used as bioenergy crop for either biomass or sugar yield. Dry matter (DM) yield and nutrient removal information is needed if sorghum is to be planted in high-nutrient receiving areas such as swine (Sus scrofa domesticus) spray fields. The objectives of this 4-yr experiment (2012 through 2015) were to determine the effect of five N fertilization rates (0, 67, 134, 201, and 268 kg N ha(-1) yr(-1)) on DM yield and nutrient (N, P, and K) removal of cultivars Blade ES5200 (biomass) and M81-E (sweet). The DM yield of ES5200 plateaued at 18.5 and 18.9 Mg ha(-1) in 2012 and 2014, respectively, when N rate was 67 kg ha(-1). Th ere was no N fertilization effect on DM yield of M81-E, which were 11.1 and 15.0 Mg ha(-1) in 2012 and 2014, respectively. Early season excess rainfall in 2013 and 2015 negatively affected yield of both sorghums. Nutrient removal for ES5200 was 87 to 139 kg N ha(-1), 20 to 23 for kg P ha(-1), and 187 to 205 kg K ha(-1). For M81-E, nutrient removal was 52 to 118 kg N ha(-1), 8 to 20 for kg P ha(-1), and 92 to 156 kg K ha(-1). Sorghum cultivars responded differently to N fertilization. High DM yield supports sorghum as a bioenergy crop, however, the relatively low nutrient removal rate may limit its utilization in nutrient-rich environments such as spray fields.
- 出版日期2017-8
