Foliar application of silica sol alleviates boron toxicity in rice (Oryza sativa) seedlings

Sinniah, U. R., Wahyuni, S., Syahputra, B. S. A. and Gantait, S. 2012. A potential retardant for lodging resistance in direct seeded rice ( Oryza sativa L.). Can. J. Plant Sci. 92: 13–18. Yield losses in rice are heavy, particularly when lodging occurs after heading. A major contributing factor towards lodging is the tall phenotypic characteristic of the plant. In rice, application of growth retardant can reduce plant height by means of internode retardation. In this study, paclobutrazol at 50, 100 and 200 ppm was applied as a foliar application at panicle initiation on MR 219 and MR 84 cultivars and its effects on growth, lodging resistance and yield were studied. Foliar-applied growth retardant inhibited plant growth and retarded internode and culm length but increased culm diameter. All treated plants had higher bending resistance compared with the control. A significant positive correlation was observed between increased culm diameter and stem bending resistance (r=0.885). Histological studies showed greater compaction of parenchyma cells with thickening of parenchyma cell walls. Treatments with either 50 or 100 ppm paclobutrazol gave significant retardation of internodes and gave higher stem bending resistance with significant increase in yield.

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Effects of naphthalene acetic acid on yield attributes and yield of two varieties of rice (Oryza sativa L.)

Bangladesh Journal of Botany ◽

10.3329/bjb.v40i1.8004 ◽

1970 ◽

Vol 40 (1) ◽

pp. 97-100 ◽

Cited By ~ 2

Author(s):

AMM Golam Adam ◽

Nargis Jahan

Keyword(s):

Acetic Acid ◽

Oryza Sativa ◽

Grain Yield ◽

Foliar Application ◽

Naphthalene Acetic Acid ◽

Yield Attributes ◽

Yield Parameters ◽

Panicle Number ◽

Key Words Rice ◽

Number Of Branches

Effects of 100 and 200 ppm of naphthalene acetic acid (NAA) on yield attributes and yield of two varieties of rice during 2009 - 2010 Boro season were evaluated. The highest plant height was observed due to 200 ppm in both BRRI dhan-29 (V1) and BRRI dhan-50 (V2). Number of tillers per plant were found to increase due to 100 ppm NAA only in BRRI dhan-29 and varied non-significantly. Yield attributes, viz. number of branches per panicle, number of grains per panicle and filled grains per panicle increased in BRRI dhan-29, following both 100 and 200 ppm NAA, whereas, most of the yield parameters decreased in BRRI dhan-50. Due to 100 and 200 ppm NAA, grain yield per plant increased by 27.67 and 6.85%, respectively in BRRI dhan-29 though not statistically significant. However, in BRRI dhan-50 grain yield per plant decreased by 26.54% due to 100 ppm and 27.67% due to 200 ppm. Out of the two concentrations 100 ppm NAA produced better stimulation. Key words: Rice; Naphthalene acetic acid; Foliar application; Yield DOI: http://dx.doi.org/10.3329/bjb.v40i1.8004 Bangladesh J. Bot. 40(1): 97-100, 2011 (June)

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Oxadiazon Absorption, Translocation, and Metabolism in Rice (Oryza sativa) and Barnyardgrass (Echinochloa crus-galli)

Weed Science ◽

10.1017/s0043174500059890 ◽

1984 ◽

Vol 32 (6) ◽

pp. 727-731 ◽

Cited By ~ 4

Author(s):

Nagi Reddy Achhireddy ◽

Ralph C. Kirkwood ◽

William W. Fletcher

Keyword(s):

Oryza Sativa ◽

Mode Of Action ◽

Foliar Application ◽

Fixed Carbon ◽

Rice Plants ◽

Treated Leaf

The mode of action and selectivity of oxadiazon [2-tert-butyl-4(2,4-dichloro-5-isopropoxyphenyl)-δ2-1,3,4-oxadiazolin-5-one] were investigated in tolerant rice (Oryza sativaL.) and susceptible barnyardgrass [Echinochloa crus-galli(L.) Beauv. ♯3ECHCG]. Oxadiazon produced only brown spots on the foliage of rice plants at higher rates (> 500 ppmv), while LC50for barnyardgrass was 250 ppmv. Translocation of14C-oxadiazon from the treated leaf was minimal in both species; after 7 days, about 2 and 3% of applied14C translocated in rice and barnyardgrass, respectively. In rice,14C recovered in water and chloroform washings of the treated leaf was 25% in each and in barnyardgrass, 20 and 18%, respectively. After water and chloroform washings,14C-oxadiazon present in the treated leaf of barnyardgrass and rice was 36 and 26%, respectively. In rice and barnyardgrass, unaltered14C-oxadiazon represented 86 and 79% of applied14C, respectively, 7 days after application. In barnyardgrass 7 days after foliar application, oxadiazon inhibited14CO2fixation and the export of fixed carbon. The effects were less marked in rice.

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