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• W2385185324 abstract "Remotely sensing infrared canopy temperature is an efficient way to rapidly and non-destructively monitor the whole-plant response to water stress. It has often been used as a screening tool to select genotypes with drought and heat tolerance. It is reported that the drought-stressed plants show higher canopy temperature than the well-watered plants at both the vegetative- and anthesis growth stages. However, there is little information available about the effects of nutrient stress on the canopy temperature of crops. The objective of our experiment was to study the effect of different fertilization treatments on the canopy temperature of winter wheat (Triticum aestivum L.) by using infra-red thermometry. Field experiments were conducted from 2000 to 2003 at the Agricultural Experimental Station of Northwestern Sci-Tech University of Agriculture and Forestry, Yangling, Shaanxi Province, China. It is a sub-humid area susceptible to drought. We examined canopy temperature in five cultivars of winter wheat: Xiaoyan 6, Shaan 229, RB6, NR9405 and 9430. Previous studies indicated that the mean canopy temperature of these varieties after anthesis was different. Each variety received four fertilizer treatments: CK (no fertilizer), N fertilization (513.6kg/hm~2 urea), P fertilization (409.9kg/hm~2 triple super-phosphate) and NP fertilization (513.6kg/hm~2 urea plus 409.9kg/hm~2 triple super-phosphate). The treatments (variety×fertilizer) were factorially arranged in a 5×4 randomized complete block design. Each treatment was replicated three times. The area of each plot was 1.5m×1.2m (1.2m long, 6 rows at 25cm apart). The soil is classified as Eum-Orthic Anthrosol, equivalent to an Udic Haplustalf in the USDA system. The soil had the following characteristics: OM, 15.32g/kg; total-N, 0.73g/kg; NH~+_4-N, 6.28mg/kg; NO~-_3-N, 26.43mg/kg; available P, 18.20mg/kg; and available K_2O, 201mg/kg. Beginning at ear emergence, the canopy temperature of the wheat was measured using a hand-held infra-red thermometer (BAU-I, China). Canopy temperature measurements were made at noon on clear days. A total of fifteen measurements were made on 2-3 day intervals. The chlorophyll and water-soluble protein content of the flag leaves were measured three times during the grain filling stage. The transpiration and net photosynthesis rate of the flag leaves were also determined using a portable photosynthesis system (LI-6400, USA LI-COR). Five measurements were made at seven day intervals from the start of anthesis. Each determination was measured between 9:00～11:00 in the morning.The results showed that fertilization could change the canopy temperature of different wheat genotypes. Nutrient stressed plants (CK) had higher canopy temperatures compared to well-fertilized plants (NP). At the grain filling stage, the canopy temperature of winter wheat in the different fertilizer treatments had a negative relationship with the chlorophyll content, water soluble protein content, transpiration rate and net photosynthetic rate of the flag leaves. The corresponding coefficient of correlation was -0.818~(**),-0.716~(**),-0.8559~(**) and -0.6547~(**), respectively. These results indicated that there was a good relationship between canopy temperature and the nutrition status of the wheat plants. The well-fertilized plants had lower canopy temperatures compared to nutrient-stressed plants. We also observed that plants with low canopy temperature grew better than plants with high canopy temperatures. The results from this experiment indicate that canopy temperature may be an efficient method for the rapid and non-destructive monitoring of whole-plant nutrient stress." @default.
• W2385185324 created "2016-06-24" @default.
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• W2385185324 date "2005-01-01" @default.
• W2385185324 modified "2023-09-25" @default.
• W2385185324 title "Effect of fertilization on the canopy temperature of winter wheat and its relationship with biological characteristics" @default.
• W2385185324 hasPublicationYear "2005" @default.
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