Indicators of Cotton Nitrogen Status

Wiedenfeld, Bob; Wallace, B. Webb; Hons, Frank M.

doi:10.1080/01904160903006044

Cited by 23 publications

(19 citation statements)

References 18 publications

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“…Bronson et al (2001) reported that SPAD readings were less variable than petiole NO 3 meter readings for assessing N status in cotton at blooming. However, Wiedenfeld et al (2009) found petiole sap readings to be more closely related to N rate than leaf N or SPAD measurements. 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).…”

Section: Introductionmentioning

confidence: 84%

“…However, Wiedenfeld et al (2009) found petiole sap readings to be more closely related to N rate than leaf N or SPAD measurements. 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.…”

Section: Introductionmentioning

confidence: 84%

“…However at that site-year, SPAD readings did not show a significant N effect at squaring as leaf N and petiole NO 3 did. Wiedenfeld et al (2009) and Bronson et al (2001), reported that N effects exhibited in the SPAD readings could be confounded by variations in to soil moisture. In Lubbock, 2011, SPAD readings and leaf N both did not show a significant N effect at squaring, but petiole NO 3 did.…”

Section: Discussionmentioning

confidence: 99%

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

Muharam¹,

Bronson²,

Maas³

et al. 2014

Field Crops Research

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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.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

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

Muharam¹,

Bronson²,

Maas³

et al. 2014

Field Crops Research

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“…Artan oranlarda azot kullanımının açık koza sayısını azalttığı başka araştırmacılar tarafından vurgulanmıştır (Şahin ve ark. 1994;Wiedenfeld et al 2009). Bazı araştırıcılar ise artan N dozlarının açık koza sayısını etkilemediğini belirtmişlerdir (Şahin ve Hüyük 1991;Karademir ve ark.…”

Section: Bulgular Ve Tartışmaunclassified

Sıvı Hayvan Gübresinin Pamuk (G. hirsutum L.) Tarımında Üst Gübre Olarak Kullanılmasının Vegetatif Gelişmeye ve Lif Değerlerine Etkisi

Akyol

Aydın

2016

Tarla Bitkileri Merkez Araştırma Enstitüsü Dergisi

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Girişızla artan dünya nüfusuna bağlı olarak tarımsal üretimin arttırılması gerekliliği, aşırı tarımsal uygulamaların yarattığı çevresel problemlerin çözümü, bitki besleme ve gübreleme alanında yapılan çalışmalara ve çözüm önerilerine ilgiyi ve önemi her geçen gün artırmaktadır (Anaç 2010).Ülkemizin önemli tarımsal faaliyetlerinden birisi pamuk tarımıdır. Pamuk; lifi, çiğidinden elde edilen yağı ve diğer yan ürünleriyle ekonomik değeri çok yüksek bir endüstri bitkisidir. Gossypium hirsutum L. türü pamuklar normal lif verimi için sulu koşullarda, yaklaşık dekar başına 11-18 kg azota gereksinim duyarlar (Constable and Rochester 1988; Constable et al. 1990).Nazilli Pamuk Araştırma İstasyonunda yapılan bir çalışmada Nazilli 87 pamuk çeşidinde azot isteğinin tespiti amacıyla yapılan denemede, birinci toplama oranı olarak ÖzTarımsal faaliyetlerin kazançlı ve verimli olması için üretime ait girdiler iyi seçilmeli, üretim esnasında ve sonrasında oluşan çıktılar etkin bir şekilde değerlendirilmelidir. Bu çalışmada, hayvan işletmesi atıklarından sıvı hayvan gübresinin pamuk yetiştiriciliğinde üst gübre olarak kullanılabilirliği ele alınmıştır. Deneme Nazilli Pamuk Araştırma İstasyonu Müdürlüğü arazisinde kurulmuştur. Deneme 2 adet kontrol ve 4 adet sıvı hayvan gübresi olmak üzere toplam altı konudan oluşmuştur. Sıvı hayvan gübresi dozları 4, 8, 12 ve 16 kg N/da, kontrol dozları ise 0 ve 9 kg N/da (kimyasal gübre) şeklinde düzenlenmiştir. Çalışmada erkencilik oranı, açık koza sayısı, kapalı koza sayısı, çırçır randımanı, 100 tohum ağırlığı, lif mukavemeti, lif uzunluğu, lif inceliği, konularına bakılmıştır. Çalışma sonucunda sıvı hayvan gübresi uygulamasının çırçır randımanı ve 100 tohum ağırlığı üzerine olumlu etkileri belirlenmiş, kalite özelliklerine olan etkisi ise kimyasal gübre ile aynı sınıf aralığında yer aldığı ve istatistiki olarak bir farkın olmadığı görülmüştür. The Effect of Liquid Animal Manure on Vegetative Growth and Fiber Properties Used as Top-Dressing in Cotton (Gossypium hirsutum L.)Cultivation AbstractThe production inputs must be chosen carefully for profitable and efficient agricultural activities, and outputs that produced during and after production process should be assessed effectively. In this study, usability of liquid animal manure used for top-dressıng in cotton was discussed. The experiment was established in Nazilli Cotton Research Station. The trail consisted of 6 subjects, 2 of them were control subjects and 4 of them were liquid animal manure dose subjects. Liquid animal manure doses were 4, 8, 12 and 16 kg N/da, and control applications were 0 and 9 kg N/da (chemical fertilizer). In the study, earliness, number of open boll, number of closed boll; ginning outturn, 100 seed weight, fiber strength, fiber length, fiber fineness values were analyzed. As a result of the study, it was determined that liquid animal manure applications had positive effects on ginning outturn, and 100 seed weight. Animal manure applications had same class intervals with chemical fertilizer applications on quali...

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“…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. On the other hand, Wiedenfeld et al [12] reported that petiole sap readings were more closely related to N rate than leaf N or chlorophyll meter measurements. Rosolem and Van Meliss [13] and Malavolta et al [14] found that the efficiency of a chlorophyll meter in distinguishing N contents was viable well into flowering.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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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

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Indicators of Cotton Nitrogen Status

Cited by 23 publications

References 18 publications

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

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

Sıvı Hayvan Gübresinin Pamuk (G. hirsutum L.) Tarımında Üst Gübre Olarak Kullanılmasının Vegetatif Gelişmeye ve Lif Değerlerine Etkisi

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

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