Tool for real time N management

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Tool for real time N management LEAF COLOR CHART Tool for real time N management James Lasquites

LEAF COLOR CHART -First developed in Japan in late ‘80s -Further developed by: University of California Cooperative Extension (UCCE) International Rice Research Institute (IRRI) Zejiang agricultural University (ZAU) and Philippine Rice Research Institute (PhilRice) -Released in 2003

Leaf Color Chart Leaf color chart (LCC) is a reliable tool for real time N management It can be used for rapid and reliable monitoring of relative greenness of the leaf as an indicator of leaf N status.

LEAF COLOR CHART RICE WHEAT CORN

Chlorophyll meter vs Leaf Color Chart Expensive Battery operated Active sensor (LED) Low cost Sunlight (light source)

Leaf Color Chart 1 Standardized leaf color chart (developed by UCCE* in collaboration with IRRI**) released 2003 2 3

Buresh,R.J 2002

Data from 2001 Dry season (DS) and Wet Season (WS). Predicted and measured leaf N content Ndw = leaf N per unit dry weight, MT = mid tillering, PI = panicle initiation, BO = booting. Christian Witt1, 2, Julie Mae Cabrera-Pasuquin2 and Randall G. Mutters3, 2004

Leaf Color Chart Since its introduction in December 2003, more than 250,000 units of the 4-panel LCC have been produced and distributed to Asian rice farmers in Bangladesh, China, India, Indonesia, Myanmar, the Philippines

How to Use LCC Select plants for testing Randomly select at least 10 disease-free rice plants or hills in a field, where plant population is uniform. Match the leaf to the chart Select the topmost, youngest, fully expanded leaf from each hill or plant. This part best reflects the N status of the plants. Place the middle part of the leaf on the LCC and compare its color with the color panels. Do not detach or destroy the leaf.

How to Use LCC Measure the leaf color leaf color should be measured under the shade of your body. Direct sunlight affects leaf color readings. If possible, the same person should read the LCC at the same time of the day, every time. If the color of a rice leaf is in between two shades, take the average of the two values as the reading (ex. if the color is in between 3 and 4, the reading should be 3.5)

How to Use LCC Determine the average LCC Take the reading of the 10 leaves, and determine the average. If the color is 3.5 or less, N fertilizer top dressing is needed.

Using the LCC Photos from Witt et al. (2002)

7 key sites in Asia (Irrigated rice) Vietnam (2) Philippines Indonesia India (2) China (Witt, J.M.C.A. Pasuquin, R. Mutters, and R.J. Buresh, 2005)

Benefit of using LCC Saves 18-36lbs N/acres (39lbs-78lbs Urea/acre) Average Grain Yield Increase of .669 tons/acre Additional profit of US $ (20-56)/acre per season

Mean number of crops per year Saving in urea per year*, '000 t Country Irrigated rice area, '000 ha Mean number of crops per year Saving in urea per year*, '000 t 25% farmers use LCC 50% farmers use LCC 75% farmers use LCC 100% farmers use LCC Bangladesh 3,488 2 87.2 261.6 348.8 India 22,250 1.5 417.2 834.4 1,251.6 1,668.8 Indonesia 6,318 158.0 316.0 474 632.0 Philippines 2,248 56.2 112.4 168.6 224.8 Thailand 1,960 49.0 98.0 147.0 196.0 Vietnam 3,978 99.5 199.0 297.7 398.0 Asia (- China) -- 999.7 1,999.4 2,999.1 3,998.8 www.nitrogenparameters.com

International Rice Research Institute