A Corn Nitrogen Status Indicator Less Affected by Soil Water Content

Zhu, Juanjuan; Tremblay, N.; Liang, Yinli

doi:10.2134/agronj2010.0351

Cited by 16 publications

(16 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Leaf greenness was determined using a SPAD meter (Minolta SPAD 502 meter, Soil Plant Analysis Development Minolta Camera Co., Ltd., Japan). SPAD measurements were made by taking readings on the uppermost fully expanded corn leaves adaxial side (in the center along the leaf's length), avoiding the midribs except at the V2 and V4 growth stage (leaves were too narrow) similar to procedures described by Zhu et al (2011a). Plant height was determined by measuring from the plant's base to the top of newest fully developed leaf.…”

Section: Methodsmentioning

confidence: 99%

Effect of microbial‐based inoculants on nutrient concentrations and early root morphology of corn (Zea mays)

Calvo

Watts

Kloepper

et al. 2016

J. Plant Nutr. Soil Sci.

View full text Add to dashboard Cite

Microbial‐based inoculants have been reported to stimulate plant growth and nutrient uptake. However, their effect may vary depending on the growth stage when evaluated or fertilizer applied. Thus, the objective of this study was to test the hypothesis that microbial‐based inoculants known to promote root growth and nutrient uptake will promote plant growth, enhance early root development, and increase nutrient concentrations of corn (Zea mays L.). Plants were evaluated at four different growth stages and in the presence of three different nitrogen (N) fertilizers. The microbial‐based treatments evaluated were: SoilBuilder™ (SB), a filtered metabolite extract of SoilBuilder™ (SBF), a mixture of four strains of plant growth‐promoting Bacillus spp (BM), and a water‐inoculated control. The experiment also included four fertilizer treatments: urea (U), urea‐ammonium nitrate (UAN), calcium‐ammonium nitrate (CAN), and an unfertilized control. Corn plants were evaluated at growth stages V2, V4, V6, and VT. Plant growth parameters for biomass, height, and SPAD readings were enhanced by the three microbial‐based treatments. A greater effect of microbial‐based treatments was observed when plants were evaluated at V6 and VT stages. Parameters of early root development such as total root length (TRL), root surface area (RSA), and length of fine roots were enhanced when microbial‐based treatments were applied. Concentrations of N, P, and K were also increased by microbial‐based treatments compared to the non‐inoculated control. Increases in plant N concentration due to microbial‐based treatments were on average 72% for CAN, 61% for UAN, 72% for urea, and 54% for the unfertilized control. Phosphorus concentration was increased most (138%) when BM was applied with CAN. In the same way, when CAN was present, K concentration was increased by 95% with BM and 65% when SB and SBF were applied. Overall, the results demonstrate that microbial‐based inoculants evaluated in this study can positively impact corn growth and nutrient concentration, especially during the late vegetative stages. Furthermore, the results indicate that the enhancement of nutrient concentrations (N, P, and K) in this case was related to the capacity of microbial‐based treatments to impact root morphology at early stages of corn growth.

show abstract

Section: Methodsmentioning

confidence: 99%

Effect of microbial‐based inoculants on nutrient concentrations and early root morphology of corn (Zea mays)

Calvo

Watts

Kloepper

et al. 2016

J. Plant Nutr. Soil Sci.

View full text Add to dashboard Cite

show abstract

“…Chlorophyll meter readings are significantly correlated with the N concentration in corn tissue (Zhu et al, 2011). Therefore, CM readings were used in this study to determine the relative N status of corn plants at R1.…”

Section: Resultsmentioning

confidence: 99%

Winter Annual Weed Management and Nitrogen Rate Effects on Corn Yield

et al. 2013

View full text Add to dashboard Cite

Management of winter annual weeds (WAWs) can affect soil N availability and corn (Zea mays L.) production under no‐till systems. The objective of this study was to evaluate the effect of delaying WAW herbicide applications on N availability and grain yield for no‐till corn following soybean [Glycine max (L.) Merr.]. Field research was conducted in 2010 and 2011 at 14 sites with naturally‐occurring populations of WAWs in eastern Kansas. A factorial arrangement of three herbicide application dates (November–March, April, and May) and five N rates (0, 17, 34, 67, and 135 kg N ha–1) were used to evaluate the interaction between weed and N response. Corn plant population, soil nitrate‐N, early corn N uptake, chlorophyll meter (CM) readings at silking, and grain yield were measured. Analysis across site‐years, no significant interaction occurred between herbicide application date and N rate for variables measured. Delaying herbicide application until April significantly reduced early corn N uptake by 52 mg N plant–1, CM readings at silking by 3.4%, and grain yield by 0.48 Mg ha–1 across site‐years. Using the N fertilizer equivalence values (based on CM readings and grain yield), an estimated additional 16 to 17 kg N ha–1 was needed if herbicide application was delayed until April. Producers can increase corn N uptake and grain yield for rainfed no‐till corn following soybeans in eastern Kansas by applying herbicides on WAWs before April.

show abstract

“…Whereas chlorophyll content increases with N fertilization, polyphenolic content is reduced. The SPAD/Dualex ratio showed better response to N fertilization in corn fields, as well as low sensitivity to soil-water content variations [42]. As reported by Demotes-Mainard [11], SPAD readings were less reliable at predicting leaf N content in woody plants, whereas Dualex was able to measure it more precisely.…”

Section: In-field Systemsmentioning

confidence: 99%

A Review of Methods for Sensing the Nitrogen Status in Plants: Advantages, Disadvantages and Recent Advances

Muñoz-Huerta

Guevara-González

Contreras-Medina

et al. 2013

Sensors

473

270

View full text Add to dashboard Cite

Nitrogen (N) plays a key role in the plant life cycle. It is the main plant mineral nutrient needed for chlorophyll production and other plant cell components (proteins, nucleic acids, amino acids). Crop yield is affected by plant N status. Thus, the optimization of nitrogen fertilization has become the object of intense research due to its environmental and economic impact. This article focuses on reviewing current methods and techniques used to determine plant N status. Kjeldahl digestion and Dumas combustion have been used as reference methods for N determination in plants, but they are destructive and time consuming. By using spectroradiometers, reflectometers, imagery from satellite sensors and digital cameras, optical properties have been measured to estimate N in plants, such as crop canopy reflectance, leaf transmittance, chlorophyll and polyphenol fluorescence. High correlation has been found between optical parameters and plant N status, and those techniques are not destructive. However, some drawbacks include chlorophyll saturation, atmospheric and soil interference, and the high cost of instruments. Electrical properties of plant tissue have been used to estimate quality in fruits, and water content in plants, as well as nutrient deficiency, which suggests that they have potential for use in plant N determination.

show abstract

A Corn Nitrogen Status Indicator Less Affected by Soil Water Content

Cited by 16 publications

References 39 publications

Effect of microbial‐based inoculants on nutrient concentrations and early root morphology of corn (Zea mays)

Effect of microbial‐based inoculants on nutrient concentrations and early root morphology of corn (Zea mays)

Winter Annual Weed Management and Nitrogen Rate Effects on Corn Yield

A Review of Methods for Sensing the Nitrogen Status in Plants: Advantages, Disadvantages and Recent Advances

Contact Info

Product

Resources

About