Root Growth and Carbohydrate Content of <i>Phalaenopsis</i> ‘KS Little Gem’ Young Plantlets as Influenced by Temperature and Fertilizer Application

Abstract Humate-based products have been aggressively marketed to nursery producers as biostimulants which increase plant growth. Reports of their effect on container-grown trees in organic substrate are few. We tested four distinct types of biostimulants on top and root growth of Turkish hazelnut (Corylus colurna L.), grown in containers with pine-bark substrate. Treatments included: 1) an untreated control; 2) humate, applied as a dry topdress; 3) humate, formulated as a wettable powder and applied as a substrate drench; 4) humate, applied as a pre-plant root soak; 5) humate, to which various purported root growth-promoting additives had been added, also applied as a root soak. All treatments were tested within low, medium, and high fertilizer application regimes. No treatment increased top growth compared to untreated trees, and the root-soak treatments had the lowest top growth. At high and low fertilizer application rates, root length was similar for all treatments except for root-soak treatments, which had lower root lengths. At the medium fertilizer rate, root length was greatest for trees treated with granular humate applied as a dry topdressing and lowest for trees treated with root soaks.

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Interrelationship of Nitrogen and Light on Episodic Growth of Ligustrum japonicum

Journal of Environmental Horticulture ◽

10.24266/0738-2898-12.1.43 ◽

1994 ◽

Vol 12 (1) ◽

pp. 43-46

Author(s):

Jeff S. Kuehny ◽

Dennis R. Decoteau

Keyword(s):

Growth Rate ◽

Root Growth ◽

Relative Growth Rate ◽

Growth Rates ◽

Shoot Growth ◽

Fertilizer Application ◽

Relative Growth ◽

Mature Leaves ◽

Episodic Growth ◽

Ligustrum Japonicum

Abstract Exclusion of nitrogen and light from existing leaves at initiation of an episode of shoot growth decreased shoot and root relative growth rate. The combination of both nitrogen and light exclusion synergistically impacted relative growth rate for shoot (RGRs) and relative growth rate for root (RGRr). The next episode of shoot growth provided sufficient leaf area for carbohydrate assimilation and maintaining shoot and root growth rates when light was excluded from mature leaves. A better understanding of the developmental and biochemical changes of this episodic species provided useful information for timing of fertilizer application and transplanting of Ligustrum and other episodic species.

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Influence of N and P fertilizer application on root growth, leaf photosynthesis and yield performance of groundnut

Bangladesh Journal of Agricultural Research ◽

10.3329/bjar.v32i3.538 ◽

2008 ◽

Vol 32 (3) ◽

pp. 369-374 ◽

Cited By ~ 2

Author(s):

M Altab Hossain ◽

A Hamid

Keyword(s):

Root Growth ◽

Field Experiments ◽

Block Design ◽

Fertilizer Application ◽

Silty Clay ◽

Leaf Photosynthesis ◽

Pod Yield ◽

P Fertilizer ◽

Four Levels ◽

Set Up

Field experiments were carried out at the Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur during 2000-2002 to evaluate the effect of N and P applicaiton on the root growth, leaf photosynthesis and yield of groundnut (var. Basantibadam). Four levels of N (0, 20, 40 and 60 kg N/ha) and four levels of P (0, 13, 26 and 39 kg P/ha) were the treatment variables. The trial was set up in a randomized complete block design under factorial arrangement with three replications. Application of N and P fertilizer exerted significant effects on root development, photosynthesis, yield contributing characters and pod yield of the crop. Plant receiving 60 kg N and 39 kg P/ha had larger root system, greater photosynthetic rate and better yield contributing characters that resulted in the maximum pod yield which, however, was not significantly different from N60P26 treatment. Hence, it is recommended that higher yield of Basantibadam can be obtained from N60P26 kg/ha in salna silty clay loam soil of Madhupur tract (AEZ 28) of Bangladesh.DOI: http://dx.doi.org/10.3329/bjar.v32i3.538Bangladesh J. Agril. Res. 32(3) : 369-374, September 2007

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