In‐Season Nitrogen Status Sensing in Irrigated Cotton

Bronson, K. F.; Chua, Teresita T.; Booker, J. D.; Keeling, J. Wayne; Lascano, Robert J.

doi:10.2136/sssaj2003.1439

Cited by 73 publications

(55 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar to chlorophyll readings, leaf N concentrations tended to increase linearly with increasing broiler litter rates for both fall (Y = 30.5 + 0.38x, r 2 = 0.96, p < 0.001) and spring-applied litter (Y = 30.6 + 0.53x, r 2 = 0.98, p < 0.001) in each year. Since chlorophyll readings and leaf N concentrations followed a similar pattern in response to broiler litter application to cotton, our results indicated leaf chlorophyll readings can be used as an indicator of N status in the plant as reported by others (Feibo et al, 1998;Bronson et al, 2003). In addition, Reddy and Kumari (2004) reported that cotton leaf chlorophyll meter reading is a good indicator of plant growth and soil conditions for crop productivity, and is positively correlated with biomass and lint yield of cotton.…”

Section: Chlorophyll Meter Readings and Leaf Nitrogen Concentrationssupporting

confidence: 82%

Cover Crop Use for Managing Broiler Litter Applied in the Fall

et al. 2011

View full text Add to dashboard Cite

Increasing interest of using broiler litter in the fall for row crops has implications for leaching losses of nutrients, particularly N. Any cultural practice that prevents nutrient losses could be agronomically beneficial and improve soil fertility. A field study was conducted in 2007 and 2008 on Leeper silty clay loam (fine, smectitic, nonacid, thermic Vertic Epiaquepts) soil to evaluate the impacts of a winter rye (Secale cereal L.) cover crop and broiler litter timing on cotton (Gossypium hirsutum L.) yield, yield components and leaching loss of NO3–N. Broiler litter was applied to the soil at the rates of 0, 4.5, 9, and 13.4 Mg ha−1 in the fall and spring for both cover and no cover crop and incorporated immediately. Winter rye cover crop was planted following broiler litter application in the fall. Averaged across cropping system and broiler litter timing, cotton lint yield and yield components increased with increasing broiler litter application. Application of broiler litter at a rate >9 Mg ha−1 was not advantageous and exceeded N need for optimum lint yield as evidenced by increasing postharvest NO3–N in the soil profile. In the absence of cover crop and averaged across litter rates, spring‐applied broiler litter had the best agronomic response and increased lint yield by 19 and 18% compared with fall‐applied litter in 2007 and 2008, respectively. Seeding a winter rye cover crop to fall‐applied broiler litter did not benefit cotton lint yield and yield components but substantially reduced leaching loss of NO3–N.

show abstract

Section: Chlorophyll Meter Readings and Leaf Nitrogen Concentrationssupporting

confidence: 82%

Cover Crop Use for Managing Broiler Litter Applied in the Fall

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Nitrogen fertilizer has been shown to increase leaf number and leaf area (Bondada et al, 1996), plant height (Gardner and Tucker, 1967), number of nodes (Jackson and Gerik, 1990), Bronson et al, 2003). Zhao et al (2010) found that the seasonal pattern of N concentrations derived from the entire plant canopy was consistent to the analysis obtained from uppermost, fully expanded leaves.…”

Section: Introductionmentioning

confidence: 57%

“…On the other hand, factors such as crop age, plant species, leaf-soil water status, time of measurement and irradiance level can affect how well SPAD readings do in distinguishing exhibiting N treatment effects (Wood et al, 1992;Bronson et al, 2001;Wiedenfeld et al, 2009;Martinez and Guiamet, 2004). Bronson et al (2003) reported that both leaf N and SPAD readings could be used to guide N fertilization rates as early as at squaring. Rosolem and Van Meliss (2010), and Malavolta et al (2004) found that the efficiency of SPAD in distinguishing N contents was viable well into flowering.…”

Section: Introductionmentioning

confidence: 99%

Inter-relationships of cotton plant height, canopy width, ground cover and plant nitrogen status indicators

Muharam¹,

Bronson²,

Maas³

et al. 2014

Field Crops Research

View full text Add to dashboard Cite

a b s t r a c tPetiole-NO 3 , leaf N and chlorophyll (SPAD) meter readings are good in-season indicators of the N status of the uppermost part of cotton (Gossypium hirsutum L.) plants. , particularly is widely used in the USA as an in-season plant N test that guides N fertilizer recommendations in cotton. However, these N status indicators do not take account of plant biomass, canopy width or percent cover. The objectives of this study were to assess the effect of N fertilizer rates on the commonly used indicators of plant N status; leaf N, petiole sap NO 3 and chlorophyll meter (SPAD) readings and the plant growth measurements; plant height, canopy width, and percent ground cover, and determine to inter-correlations among the them. Irrigated field studies were conducted at Lubbock, TX USA in 2010 and 2011, New Deal, TX in 2010, and at Halfway, TX in 2011. Zero-N and a full N fertilizer rate of 134, 101, and 112 kg N ha −1 were used at Lubbock, New Deal, and Halfway, respectively. The 2010 cotton growing season in West Texas was much wetter than average, and the 2011 season was much drier than normal. As a result, plant height, canopy width, and ground cover were greater in the 2010 sites than in 2011. The effects of N fertilizer were greatest for the two cultivars in subsurface drip irrigation (SDI) at New Deal in 2010 for all three N status indicators, and for the three plant growth measures compared to the other site-years. Correlation analysis indicated that among the three plant N indicators, leaf N was the most sensitive to plant parameters. These effects were positive in 2010 and negative in the 2011 dry year. Petiole NO 3 was the plant N indicator that was the most insensitive to plant growth, but the marked seasonal decline pattern reduces its usefulness for late-season N management.Published by Elsevier B.V.

show abstract

“…While ratios developed from red-edge and NIR wavelengths were inclined to underestimate leaf N content, they had demonstrated both precision and accuracy characteristics. It is worth noting that other researchers such as Bronson et al [10] and Buscaglia and Varco [25] found that cotton leaf N content and leaf or canopy reflectance exhibited a stronger relationship at the green wavelength rather than in the red-edge or NIR region.…”

Section: Introductionmentioning

confidence: 80%

“…The use of chlorophyll meters at different cotton growth stages have been reported with varying results. At squaring, chlorophyll meter readings could be used to guide N fertilization rates [10]. At blooming, Bronson et al [11] found that while chlorophyll meter readings were superior to petiole NO3 meter readings for assessing N status in cotton.…”

Section: Introductionmentioning

confidence: 99%

Estimating Cotton Nitrogen Nutrition Status Using Leaf Greenness and Ground Cover Information

et al. 2015

View full text Add to dashboard Cite

Assessing nitrogen (N) status is important from economic and environmental standpoints. To date, many spectral indices to estimate cotton chlorophyll or N content have been purely developed using statistical analysis approach where they are often subject to site-specific problems. This study describes and tests a novel method of utilizing physical characteristics of N-fertilized cotton and combining field spectral measurements made at different spatial scales as an approach to estimate in-season chlorophyll or leaf N content of field-grown cotton. In this study, leaf greenness estimated from spectral measurements made at the individual leaf, canopy and scene levels was combined with percent ground cover to produce three different indices, named TCCLeaf, TCCCanopy, and TCCScene. These indices worked best for estimating leaf N at early flowering, but not for chlorophyll content. Of the three indices, TCCLeaf showed the best ability to estimate leaf N (R 2 = 0.89). These results suggest that the use of green and red-edge wavelengths derived at the leaf scale is best for estimating leaf greenness. TCCCanopy had a slightly lower R 2 value than TCCLeaf (0.76), suggesting that the utilization of yellow and red-edge wavelengths obtained at the canopy level could be used as an alternative to estimate leaf N in the absence of leaf spectral

show abstract

In‐Season Nitrogen Status Sensing in Irrigated Cotton

Cited by 73 publications

References 32 publications

Cover Crop Use for Managing Broiler Litter Applied in the Fall

Cover Crop Use for Managing Broiler Litter Applied in the Fall

Inter-relationships of cotton plant height, canopy width, ground cover and plant nitrogen status indicators

Estimating Cotton Nitrogen Nutrition Status Using Leaf Greenness and Ground Cover Information

Contact Info

Product

Resources

About