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Agronomy Journal : Just Published

 

Accepted, edited articles are published here after author proofing to provide rapid publication and better access to the newest research. Articles are compiled into issues at dl.sciencesocieties.org/publications/aj, which includes the complete archive.

Citation | Articles posted here are considered published and may be cited by the doi.

Zhu, Q., M.J. Schlossberg, R.B. Bryant, and J.P. Schmidt. 2012. Creeping bentgrass putting green response to foliar nitrogen fertilization. Agron. J. doi:10.2134/agronj2012.0157

Current issue: Agron. J. 108(3)



  • CROP ECONOMICS, PRODUCTION & MANAGEMENT

    • David W. McIntosh, Gary E. Bates, Patrick D. Keyser, Fred L. Allen, Craig A. Harper, John C. Waller, Jessie L. Birckhead and William M. Backus
      Forage Harvest Timing Impact on Biomass Quality from Native Warm-Season Grass Mixtures

      Biomass production systems using native warm-season grasses can allow for an early-season harvest (for forage) followed by a dormant harvest (for biomass). A study was conducted to investigate the impact of harvest timing and grass species on the chemical composition of harvested forage and biomass. The three-species composite treatments were switchgrass (SG) (Panicum virgatum L.); a two-way blend of big bluestem (Andropogon gerardii V.) (BB) and indiangrass (Sorghastrum nutans L.) (IG); and a three-way mixture of SG, BB, and IG. Harvest treatments were a biomass harvest (BH) in late fall, early-boot (EB) harvest (for forage) followed by BH, or early-seedhead harvest (ESH) (for forage) followed by BH. (continued)

      Core Ideas:
      • Use mixed species native warm-season grasses for forage/biomass production.
      • Provide nutritional and quality data on switchgrass and mixed species stands for forage and ethanol production.
      • It is possible to alter forage nutritive values/biomass quality with the addition of other grasses with switchgrass.

      doi:10.2134/agronj2015.0560
      Published: April 22, 2016



    • William J. Cox and Jerome Henry Cherney
      Inconsistent Yield Responses Add Complexity to Identifying Optimum Soybean Seeding Depths

      Soybean [Glycine max (L.) Merr.] seeding depth from 2.54 to 3.81 cm is considered optimum in northern rainfed regions, despite limited recent field research. We evaluated four seeding depths (2.54, 3.81, 5.08, and 6.35 cm) in three separate field-scale studies (2013 and 2014) in New York to identify optimum depth(s) on well-drained silt loam, somewhat poorly drained silty clay/silt loam, and somewhat excessively drained gravelly loam sites. Quadratic regression equations predicted minimum yield (4.49 Mg ha–1) at 4.71 cm in 2013 but maximum yield (4.22 Mg ha–1) at 4.85 cm in 2014 on the silt loam. Soybean populations showed negative linear responses to seeding depth at the other two sites in both years, but yield did not respond to seeding depth on the silty clay/silt loam, and showed a positive quadratic response (maximum yield of 4.21 Mg ha–1 at 4.55 cm in 2013) on the gravelly loam. (continued)

      Core Ideas:
      • Soybean seeding depth from 2.54 to 3.81 cm is considered optimum in northern rainfed regions.
      • Soybean yield showed site-specific yield responses to seeding depth.
      • Site-specific yield responses underscore the complexity in identifying an optimum soybean seeding depth.

      doi:10.2134/agronj2015.0404
      Published: April 22, 2016



    • Lawton Nalley, Jesse Tack, Andrew Barkley, Krishna Jagadish and Kristofor Brye
      Quantifying the Agronomic and Economic Performance of Hybrid and Conventional Rice Varieties

      The objective of this research is to estimate and compare the agronomic and economic performance of hybrid and conventional rice (Oryza sativa L.) varieties in the Mid-South of the United States. The introduction of hybrid rice for commercial production has given producers an alternative to traditionally cultivated, conventional (inbred) lines. Adoption rates of hybrid rice have grown to over 40% in some regions of the Mid-South; however, its milling quality is a concern. Producer revenues are based on both rough (paddy) rice yield and postharvest processing, or milling. (continued)

      Core Ideas:
      • Rice producers’ revenue is based on both rough rice yield and the subsequent milling outcome.
      • Early hybrid lines had high paddy but low milling yields which questioned their economic status.
      • We find that hybrids had a distinct paddy yield advantage over inbred lines.
      • We find hybrids had a lower milling quality than inbred lines but exceed industry standards.
      • We find hybrids outperform inbred varieties in absolute, profit ha–1 and relative profit margin.

      doi:10.2134/agronj2015.0526
      Published: May 2, 2016



  • ORGANIC AGRICULTURE & AGROECOLOGY

    • Weiqi Wang, Qingwen Min, Jordi Sardans, Chun Wang, Dolores Asensio, Mireia Bartrons and Josep Peñuelas
      Organic Cultivation of Jasmine and Tea Increases Carbon Sequestration by Changing Plant and Soil Stoichiometry

      Organic cultivation methods would be a good alternative to conventional cultivation, avoiding the use of industrial fertilizer and reducing the risk of eutrophication, but its impacts on soil elemental composition and stoichiometry warrants to be clearly stated. This study was conducted to determine the effects of long-term organic cultivation on soil elemental composition, stoichiometry, and C storing capacity and CO2 emissions in the plant-soil systems of jasmine (Jasminum spp.) and tea [Camellia sinensis (L.) Ktze.] plantations in Fujian and other regions in China. We examined the impact of organic cultivation on the concentrations, contents and stoichiometric relationships among C, N, P, and K. Organic cultivation was associated with lower plant N and P concentrations, and P mineralomasses and with higher total plant C/N, C/P, C/K, and N/P ratios and higher soil N and P concentrations and contents at some depths. (continued)

      Core Ideas:
      • Jasmine and tea cultivation have a long history in Fujian and other regions in China
      • We explored their organic cultivation for the future viability of these crops
      • Organic cultivation increased nutrient-use efficiency
      • Soil was able to accumulate more C under organic cultivation
      • Organic cultivation improved soil fertility without affecting economic profits

      doi:10.2134/agronj2015.0559
      Published: April 22, 2016



  • SOIL FERTILITY & CROP NUTRITION

    • Wenkui Zheng, Changling Sui, Zhiguang Liu, Jibiao Geng, Xiaofei Tian, Xiuyi Yang, Chengliang Li and Min Zhang
      Long-Term Effects of Controlled-Release Urea on Crop Yields and Soil Fertility under Wheat–Corn Double Cropping Systems

      The long-term effects of controlled-release urea (CRU) on crop yields and soil properties were investigated in lysimeters under wheat and corn rotation system from 2009 to 2014 in northern China. The CRU included polymer-coated urea (PCU), sulfur-coated urea (SCU), and polymer coating of sulfur-coated urea (PSCU) was applied at 147, 210 kg N ha–1 for wheat and 262.5, 375 kg N ha–1 for corn and the urea was applied at 210 kg N ha–1 for wheat and 375 kg N ha–1 for corn. Results showed that the N release characteristics of three kinds of CRU in field condition were all closely matched to the N requirement of crops. Consequently, the CRU treatments improved wheat and corn yields by 3.2 to 10.1% and 4.9 to 11.1%, increased apparent N use efficiency by 45.9 to 53.8% in wheat, and 36.2 to 45.4% in corn, respectively, compared with urea. (continued)

      Core Ideas:
      • The long-term effect of controlled-release urea on crop yield and soil chemical properties was studied.
      • The N release rates of controlled-release urea were closely matched to the demand for N during the whole growth periods of crops.
      • The wheat and corn yields were increased by 3.2 to 10.1% and 4.9 to 11.1% by controlled-release urea fertilization, compared with urea treatment.

      doi:10.2134/agronj2015.0581
      Published: April 22, 2016



    • Guozhong Feng, Yongjie Zhang, Yanling Chen, Qian Li, Fanjun Chen, Qiang Gao and Guohua Mi
      Effects of Nitrogen Application on Root Length and Grain Yield of Rain-Fed Maize under Different Soil Types

      The effect of fertilizer N on maize (Zea mays L.) root size has been reported with inconsistency. It remains unclear whether a quantitative relationship exists between soil NO3–N and root growth under field conditions. A 3-yr field experiment was conducted in three soils (loamy clay, clay loam, and sandy loam) with five N treatments (from 0–312 kg N ha–1). Soil NO3–N concentration and total root length were determined to a depth of 60 cm at the silking stage. (continued)

      Core Ideas:
      • Plants grown in clay loam soil had larger root than in loamy clay and sandy loam soils.
      • A parabolic relationship between soil nitrate-N concentration and total root length.
      • A weak parabola relationship between N supply and root length was found in loamy clay soil and clay loam soil, but not in sandy loam soil. Root length and the maximum yield reached synchronously at optimum N rates (168–240 kg N ha–1 in the present study).

      doi:10.2134/agronj2015.0367
      Published: April 22, 2016



  • SOIL TILLAGE, CONSERVATION & MANAGEMENT

    • Patrick Trail, Ozzie Abaye, Wade E. Thomason, Thomas L. Thompson, Fatou Gueye, Ibrahima Diedhiou, Michel B. Diatta and Abdoulaye Faye
      Evaluating Intercropping (Living Cover) and Mulching (Desiccated Cover) Practices for Increasing Millet Yields in Senegal

      Located within the Sahel region, Senegal faces several agricultural production challenges. Limited rainfall, poor soil fertility, and insufficient agronomic inputs all contribute to low pearl millet [Pennisetum glaucum (L.) R. Br.] yields. This study was initiated to assess the potential for increasing millet yields through intercropping (living cover) and mulching (desiccated cover) practices. (continued)

      Core Ideas:
      • Intercropping millet with cowpea or mungbean was found to increase millet grain yield compared to millet that was grown alone. Yield increases as high as 55% were recorded.
      • Increasing ground cover through mulching of millet was found to significantly increase soil moisture compared to millet grown with no additional ground cover. Soil moisture increased up to 14% in mulched soils compared to unmulched soils.
      • Intercropping millet with a legume (cowpea or mungbean) always resulted in a higher combined yield than growing either the millet or the legume by itself.

      doi:10.2134/agronj2015.0422
      Published: May 2, 2016



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