Increased N-use efficiency using a chlorophyll meter on high-yielding irrigated rice

Peng, Shaobing; Garcia, F.V.; Laza, Rebecca C.; Sanico, Arnel L.; Visperas, R. M.; Cassman, Kenneth G.

doi:10.1016/0378-4290(96)00018-4

Cited by 354 publications

(214 citation statements)

References 22 publications

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“…O uso do clorofilômetro tem sido estudado para diversas culturas, e com resultados satisfatórios quanto à avaliação do estado nutricional de N para as culturas de alho (VILLAS BÔAS et al 2003;LIMA, 2005), algododoeiro (NEVES et al 2005), feijoeiro (SORATTO et al 2004;SILVEIRA et al 2003), milho (GODOY et al 2007; CHAPMAN e BARRETO, 1997), batata (BOOIJ et al, 2000;GIL et al, 2002), e para a cultura de arroz (PENG et al, 1995). Entretanto, faz-se necessária sua calibração para as diferentes culturas em cada situação.…”

Section: Green Hue In Vernalized Garlic Leaves In Response To Nitrogeunclassified

Coloração verde nas folhas da cultura do alho vernalizado em resposta à adubação nitrogenada

et al. 2008

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RESUMOO experimento foi desenvolvido em campo com o objetivo de avaliar a viabilidade do monitoramento da adubação nitrogenada em cobertura, na cultura do alho vernalizado, por meio de medidas indiretas da intensidade de coloração verde nas folhas (medidor de clorofila SPAD), relacionando-as com o estado nutricional das plantas e com a produção de bulbos. O delineamento experimental utilizado foi o de blocos ao acaso, compreendendo seis doses de nitrogênio (0; 20; 40; 80; 160; 320 kg ha -1 ) com cinco repetições. O N foi aplicado parceladamente em cobertura aos 20 e 75 dias após a emergência. Foram obtidos os dados de intensidade de coloração verde (ICV) e teor de N das folhas, massa média, produção total e classificação de bulbos, segundo o tamanho. A concentração de N e a ICV foram influenciadas pelas doses de N. Houve correlação significativa entre a ICV e o teor de N nas folhas e também entre a produção de bulbos e a ICV e entre a produção e o teor de N. O valor máximo de ICV foi alcançado com a dose de 250 kg ha -1 e a produtividade máxima e a massa média de bulbos foram obtidas na dose de 268 kg ha -1 o que pela proximidade desses valores revelam que o medidor de clorofila pode ser utilizado para recomendação da adubação nitrogenada na cultura do alho. Com a dose de 237 kg ha -1 de N, obteve-se maior rendimento em R$. Palavras-chave:Allium sativum L., produção de bulbos, estado nutricional ABSTRACT GREEN HUE IN VERNALIZED GARLIC LEAVES IN RESPONSE TO NITROGEN FERTILIZATIONA field experiment was carried out in order to determine the feasibility of monitoring nitrogen fertilization of vernalized garlic production by means of the correlation between the indirect measurement of the intensity of the green hue of the leaves (SPAD chlorophyll meter) and the plant nutritional condition and bulb yield. A randomized complete block design was used with six doses of nitrogen (0, 20, 40, 80, 160, 320 kg ha -1 ) and five repetitions. Nitrogen rates were side-dressed applied at the 20 th and the 75 th days after emergence. Data were collected for green hue intensity (GHI) and N content of leaves, average weight, total production and bulb classification as per size. Nitrogen concentrations as well as GHI were affected by N rates. Significant correlations were found between GHI and N content of leaves, between bulb production and GHI, and also between output and N contents. The maximum GHI value was attained a N rate of 250 kg ha -1 and the maximum productivity and the maximum average bulb weight were attained at 268 kg ha -1. Given the proximity of these rates, these results indicate that chlorophyll measurement can be used for the recommendation of nitrogen fertilization of garlic cultures. The best economic return was obtained with a 237 kg ha -1 N rate.Key words: Allium sativum L., bulb production, nutritional condition.

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Section: Green Hue In Vernalized Garlic Leaves In Response To Nitrogeunclassified

Coloração verde nas folhas da cultura do alho vernalizado em resposta à adubação nitrogenada

et al. 2008

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“…Nitrogen use efficiency is particularly low in intensive irrigated rice systems of subtropical and tropical Asia, and the available evidence suggests that NUE has remained virtually unchanged during the past 20 to 30 years, despite in-creases in yield over time (74). Carefully conducted research has demonstrated, however, that rice is capable of taking up fertilizer N very efficiently (77) provided the timing of N applications is congruent with the dynamics of soil N supply and crop N demand (78). These principles have recently become embedded in a new approach for nutrient management (79,80).…”

Section: Improving Nitrogen Use Efficiencymentioning

confidence: 99%

Meeting Cereal Demand While Protecting Natural Resources and Improving Environmental Quality

Cassman

Dobermann

Walters

et al. 2003

Annu. Rev. Environ. Resour.

885

476

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Agriculture is a resource-intensive enterprise. The manner in which food production systems utilize resources has a large influence on environmental quality. To evaluate prospects for conserving natural resources while meeting increased demand for cereals, we interpret recent trends and future trajectories in crop yields, land and nitrogen fertilizer use, carbon sequestration, and greenhouse gas emissions to identify key issues and challenges. Based on this assessment, we conclude that avoiding expansion of cultivation into natural ecosystems, increased nitrogen use efficiency, and improved soil quality are pivotal components of a sustainable agriculture that meets human needs and protects natural resources. To achieve this outcome will depend on raising the yield potential and closing existing yield gaps of the major cereal crops to avoid yield stagnation in some of the world's most productive systems. Recent trends suggest, however, that increasing crop yield potential is a formidable scientific challenge that has proven to be an elusive goal.

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“…In real-time N management using an SPAD meter, the timing of in-season N application was determined based on the current value of SPAD measurement and a critical SPAD value (Peng et al, 1996). In this system, SPAD measurements were taken weekly on most recent fully expanded leaves from 15 days after transplanting to fl owering.…”

Section: Resultsmentioning

confidence: 99%

“…The ability to predict chlorophyll content on a leaf-area basis from SPAD readings was demonstrated in many crop species (Jiang et al, 1986;Yadava, 1986;Dwyer et al, 1991). The SPAD meter has also been used to estimate leaf N status of rice leaves with the goal of predicting the need for fertilizer-N topdressing in real-time N management (Takebe et al, 1990;Turner et al, 1991;Peng et al, 1996). It is a useful tool for fi eld researchers, extension specialists, and crop consultants who do not have access to well-equipped laboratories.…”

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Comparison and Standardization among Chlorophyll Meters in their Readings on Rice Leaves

Huang

Peng

2004

Plant Production Science

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Increased N-use efficiency using a chlorophyll meter on high-yielding irrigated rice

Cited by 354 publications

References 22 publications

Coloração verde nas folhas da cultura do alho vernalizado em resposta à adubação nitrogenada

Coloração verde nas folhas da cultura do alho vernalizado em resposta à adubação nitrogenada

Meeting Cereal Demand While Protecting Natural Resources and Improving Environmental Quality

Comparison and Standardization among Chlorophyll Meters in their Readings on Rice Leaves

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