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Use of nondestructive optical sensor...

Basyouni, Rania.

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Use of nondestructive optical sensors in assessing nitrogen status in six popular greenhouse plants.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Use of nondestructive optical sensors in assessing nitrogen status in six popular greenhouse plants./
作者:	Basyouni, Rania.
面頁冊數:	348 p.
附註:	Source: Masters Abstracts International, Volume: 55-01.
Contained By:	Masters Abstracts International55-01(E).
標題:	Horticulture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1596278
ISBN:	9781321966817

Use of nondestructive optical sensors in assessing nitrogen status in six popular greenhouse plants.
Basyouni, Rania.

Use of nondestructive optical sensors in assessing nitrogen status in six popular greenhouse plants. - 348 p.

Source: Masters Abstracts International, Volume: 55-01.

Thesis (M.S.)--Oklahoma State University, 2014.

Floriculture growers are always looking for new methods and technologies to help them improve crop productivity, enhance competitiveness, and increase sustainability. Implementing precise site-specific management techniques on greenhouse crops allows growers to cut costs of nitrogen (N) fertilizer, assure a higher quality product, and simultaneously being more eco-friendly. GreenSeeker(TM) technology, introduced a new nondestructive, pocket-sized sensor to generate normalized difference vegetative index (NDVI) values that use active optical sensors to measure greenness reflectance from plant leaves. The values are a good indirect indicator of plant biomass, chlorophyll, and N status. The sensor has proven effective in determining nitrogen status in field crops. To evaluate the GreenSeeker(TM) NDVI sensor effectiveness on potted greenhouse plants, two cultivars of begonia, dianthus, geranium, marigold, poinsettia, and zinnia, were supplemented with five different N treatments (0, 2.5, 5, 10, 15, or 20 g) of a 15N-9P-12K controlled release fertilizer, ranging from deficient to excessive. After two weeks, half of the pots with the lowest treatments and readings (0, 2.5, and 5 g) were supplemented with extra fertilizer for treatment correction. All pots were completely randomized. GreenSeeker(TM) NDVI values were compared to the soil plant analysis development (SPAD) chlorophyll meter, atLEAF chlorophyll meter, the NDVI prototype sensor, a hooded GreenSeeker(TM) NDVI sensor with a smaller field of view, and actual leaf N concentration to determine efficiency. Plants were assessed at the end of commercial production period by recording final height, final width, number of flowers, number of bracts, number of stems, flower diameter, fresh weight and/or dry weight. Collected NDVI values showed different trends among species and cultivars within fertilizer treatments. Results also showed a weak correlation between GreenSeeker(TM) NDVI sensor readings and leaf N concentration in the first two weeks of sensing due to interfering noise reflected from the media surrounding the small plants. As plants grew bigger, the correlation was more significant, indicating that the sensor is a valid tool for assessing leaf N concentration in the vegetative stage before flowering and after filling out the pot. However, the treatment correction results varied between species and cultivars, with greater responses seen in poinsettia, dianthus, and geranium. As for the rest of the species, only marginal improvement in plant quality and salability at marketing time was noticed.

ISBN: 9781321966817Subjects--Topical Terms:

555447
Horticulture.

Use of nondestructive optical sensors in assessing nitrogen status in six popular greenhouse plants.
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