Nutrient Dynamics in Switchgrass as a Function of Time
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Area and Treatments Description
2.2. Soil Sampling and Analysis
2.3. Switchgrass Sampling and Analyses
2.4. Statistical Analysis
3. Results
3.1. Switchgrass Yield
3.2. Nutrient Removal with Harvest
3.3. Nitrogen Dynamics
3.4. Phosphorus and Potassium Dynamics
3.5. Secondary and Micronutrient Dynamics
4. Discussion
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Year | pH | NO3-N | P | K | SO4-S | Ca | Mg | Fe | Zn | B | Cu |
---|---|---|---|---|---|---|---|---|---|---|---|
kg ha−1 | mg kg−1 | ||||||||||
2008 kg N ha−1 | 6.3 ± 0.2 | 3 ± 0.8 | 16 ± 1 | 118 ± 16 | 8.4 ± 0.2 | 1563 ± 125 | 317 ± 32 | 48.5 ± 11 | 0.7 ± 0.1 | 0.34 ± 0.0 | 1.4 ± 0.1 |
2009 | 6.2 ± 0.2 | 6.4 ± 2.7 | 17 ± 2 | 109 ± 14 | 5.7 ± 0.3 | 1538 ± 172 | 309 ± 31 | 60.3 ± 9 | 0.8 ± 0.1 | 0.36 ± 0.0 | 1.5 ± 0.0 |
2010 | 6.4 ± 0.1 | 2.5 ± 1.5 | 14.9 ± 3 | 110 ± 8 | 5.9 ± 0.5 | 1560 ± 107 | 310.7 ± 16 | 58.4 ± 8 | 0.7 ± 0.2 | 0.27 ± 0.0 | 1.5 ± 0.3 |
Year | Date | AGDD §§ | MSC | Growth Stage | Description |
---|---|---|---|---|---|
2008 | 12 June 2008 | 755 | 2.2 | E1: Elongation-Stem elongation | First node palpable/visible |
2008 | 24 July 2008 | 1452 | 3.3 | R2: Reproductive-Floral development | Spikelets fully emerged/peduncle not emerged |
2008 | 5 September 2008 | 2175 | 4.6 | S3: Seed development and ripening | Hard dough |
2008 | 30 October 2008 | 2611 | 5.3 | -- Postripening/senescence | -- |
2008 | 4 December 2008 | 2672 | 5.4 | -- Postripening/senescence | -- |
2009 | 28 February 2009 | 2748 | 1.0 | V0: Vegetative-Leaf development | Emergence of 1st leaf |
2009 | 3 July 2009 | 1180 | 2.9 | E4: Elongation-Stem elongation | 4th node palpable/visible |
2009 | 9 August 2009 | 1822 | 4.0 | S0: Seed development and ripening | Caryopsis visible |
2009 | 25 September 2009 | 2426 | 5.0 | S5: Seed development and ripening | Endosperm dry/seed ripe |
2009 | 19 November 2009 | 2627 | 5.3 | -- Postripening/senescence | -- |
2010 | 26 January 2010 | 2642 | 0.9 | G5: Germination | Coleoptile emergence from soil |
2010 | 2 March 2010 | 2642 | 0.9 | G5: Germination | Coleoptile emergence from soil |
2010 | 15 July 2010 | 1323 | 3.1 | R1: Reproductive-Floral development | Inflorescence emergence/1st spikelet visible |
2010 | 3 September 2010 | 2240 | 4.7 | S4: Seed development and ripening | Endosperm hard/physiological maturity |
2010 | 28 October 2010 | 2803 | 5.6 | -- Postripening/senescence | -- |
2010 | 2 December 2010 | 2878 | 5.8 | -- Postripening/senescence | -- |
2011 | 7 January 2011 | 2888 | 0.9 | G5: Germination | Coleoptile emergence from soil |
2011 | 25 March 2011 | 3031 | 1.1 | V1: Vegetative-Leaf development | First leaf collared |
2008 | 2009 | 2010 | |||||||
---|---|---|---|---|---|---|---|---|---|
Yield | N | P | K | N | P | K | N | P | K |
2008 | −0.75 *** | −0.67 *** | −0.74 *** | -- | -- | -- | -- | -- | -- |
2009 | -- | -- | -- | −0.08 NS | −0.20 NS | −0.26 NS | -- | -- | -- |
2010 | -- | -- | -- | -- | -- | -- | −0.01 NS | -- | −0.18 NS |
Regression | Plant | Ca | Mg | S | Na | Cu | Fe | Zn | Mn | Ni |
---|---|---|---|---|---|---|---|---|---|---|
Model | Portion | p-Value | ||||||||
2008 | AG | 0.001 | <0.0001 | <0.0001 | NS | NS | NS | <0.0001 | <0.0001 | 0.008 |
Linear | BG | NS | 0.0013 | <0.001 | NS | 0.001 | <0.001 | NS | 0.0095 | 0.0003 |
2008 | AG | 0.006 | <0.001 | <0.0001 | NS | NS | NS | <0.0001 | <0.0001 | 0.015 |
Quadratic | BG | NS | 0.002 | <0.0001 | NS | NS | <0.0001 | NS | <0.0001 | <0.0001 |
2009 | AG | 0.032 | <0.001 | <0.0001 | NS | <0.0001 | NS | <0.001 | 0.005 | NS |
Linear | BG | 0.002 | 0.032 | 0.012 | NS | 0.0005 | 0.0037 | NS | 0.022 | <0.0001 |
2009 | AG | NS | <0.001 | <0.0001 | NS | <0.0001 | NS | <0.0001 | 0.017 | NS |
Quadratic | BG | 0.001 | NS | 0.004 | NS | 0.0027 | 0.0049 | NS | 0.037 | <0.001 |
2010 | AG | 0.03 | 0.0126 | --- | --- | 0.001 | NS | 0.012 | --- | --- |
Linear | BG | NS | --- | --- | NS | NS | NS | NS | --- | --- |
2010 | AG | 0.044 | 0.0107 | --- | --- | 0.0036 | NS | 0.032 | --- | --- |
Quadratic | BG | NS | --- | --- | NS | NS | NS | NS | --- | --- |
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Massey, J.; Antonangelo, J.; Zhang, H. Nutrient Dynamics in Switchgrass as a Function of Time. Agronomy 2020, 10, 940. https://doi.org/10.3390/agronomy10070940
Massey J, Antonangelo J, Zhang H. Nutrient Dynamics in Switchgrass as a Function of Time. Agronomy. 2020; 10(7):940. https://doi.org/10.3390/agronomy10070940
Chicago/Turabian StyleMassey, Joshua, João Antonangelo, and Hailin Zhang. 2020. "Nutrient Dynamics in Switchgrass as a Function of Time" Agronomy 10, no. 7: 940. https://doi.org/10.3390/agronomy10070940
APA StyleMassey, J., Antonangelo, J., & Zhang, H. (2020). Nutrient Dynamics in Switchgrass as a Function of Time. Agronomy, 10(7), 940. https://doi.org/10.3390/agronomy10070940