Journal Article10.1080/00103621003759304
Impact of Fertilization and Irrigation on the Correlation between the Soil Plant Analysis Development Value and Yield of Maize
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TL;DR: In this paper, the degree of nitrogen (N) supply in maize under non-irrigated and irrigated conditions was measured using a Soil Plant Analysis Development (SPAD) 502 portable chlorophyll meter for 4 years.
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Abstract: The degree of nitrogen (N) supply in maize under nonirrigated and irrigated conditions was measured using a Soil Plant Analysis Development (SPAD) 502 portable chlorophyll meter for 4 years. The lowest readings were obtained from a plot that has not been fertilized for 23 years. The highest SPAD value in the nonirrigated treatments was obtained in 2004, whereas the lowest was measured in the drought year of 2007. In the irrigated treatments, there was a closer correlation between fertilization and SPAD values during the examined 4 years. As the result of fertilization, the average increase of SPAD values in the irrigated plots was greater than in the nonirrigated plots. The result of irrigation on SPAD values was significant every year (P < 0.001), with the largest increase in the drought year of 2003. In the nonirrigated treatments, fertilization and grain yield had a weak correlation, whereas in the irrigated treatments the correlation between the two variables was strong.
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Citations
Assessing the impacts of agricultural drought (SPI/SPEI) on maize and wheat yields across Hungary
Safwan Mohammed,Karam Alsafadi,G. O. Enaruvbe,Bashar Bashir,Ahmed Elbeltagi,Adrienn Széles,Abdullah Alsalman,E.G. Harsányi +7 more
TL;DR: This paper examined the physical properties of agricultural drought (i.e., intensity, duration, and severity) in Hungary from 1961 to 2010 based on the standardized precipitation index (SPI) and the Standardized Precipitation Evapotranspiration Index (SPEI), and found that the western part of Hungary has significantly more prone to agricultural drought than the eastern part of the country.
Corn production response to tillage and nitrogen application in dry-land environment
Kesi Liu,Pawel Wiatrak +1 more
TL;DR: In this article, a 3-yr study was conducted to determine the effects of three tillage systems (conventional tillage, CT, strip tillage and no tillage) and five N rates (0, 45, 90, 135, and 180 kg N ha−1) on corn (Zea mays L.) plant characteristics at R1 growth stage (the first reproductive stage, silk stage) and grain yield in dryland rain fed environment.
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Corn (Zea Mays L.) Plant Characteristics and Grain Yield Response to N Fertilization Programs in No-Tillage System
Kesi Liu,Pawel Wiatrak +1 more
TL;DR: The results indicate that N application timing was not important factor to affect corn plant characteristics and grain yield under rain-fed and low corn yield dryland conditions and the authors may not expect a significant grain yield increase with application exceeding 90 kg N ha-1 under these conditions.
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The plant nutrition impact on the quality and quantity parameters of maize hybrids grain yield based on different statistical methods
TL;DR: The authors analyzed the interaction of genotype in treatment (NPK fertilizer) on grain yield, protein content, oil content, and the starch content on 13 maize hybrids using analysis by the model of additive and multiplier effects AMMI and evaluated genotypes, treatments, and their interactions using biplot in Hungary.
Maize Production under Drought Stress: Nutrient Supply, Yield Prediction
Adrienn Széles,E. Horvath,Károly Simon,Péter Zagyi,László Huzsvai +4 more
TL;DR: Maize production under drought stress: SPAD and LAI are suitable for yield prediction.
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References
Evaluating the relationship between leaf chlorophyll concentration and SPAD-502 chlorophyll meter readings
TL;DR: It is suggested that SPAD calibration curves should generally be parameterised as non-linear equations, and it is hoped that the relationships between [chl] and SPAD and the simulations of the present study can facilitate the interpretation of chlorophyll meter calibrations in relation to optical properties of leaves in future studies.
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Photosynthetic pigments, nitrogen, chlorophyll a fluorescence and SPAD-502 readings in coffee leaves
TL;DR: The SPAD-502 has been shown to be a good tool to diagnose the integrity of the photosynthetic system in coffee leaves, and can thus help in the advanced interpretations of the photochemical process of these plants.
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Comparison of corn leaf nitrogen concentration and chlorophyll meter readings
TL;DR: Tissue testing of com leaves for nitrogen (N) concentration is not widely used because it is easier and perhaps more economical to apply sufficient fertilizer than to risk a yield reduction because of an N deficiency.
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SPAD-chlorophyll response to nitrogen fertilization and evaluation of nitrogen status in dryland and irrigated pumpkins
John M. Swiader,Ame A. Moore +1 more
TL;DR: The results suggest that maximum or near-maximum yields of both dryland and irrigated pumpkins can be expected when leaf SPAD readings are ∼56.7–59.0 units at anthesis, ∼55.1–57.6 units at early-fruiting, and 52.2–54.3 units at mid- fruiting.
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