Effect of growth-stimulants and weed control on transplanted rice (Oryza sativa) varieties
Keywords:
Abstract
Y A field experimeilt was conducted with treatments of growth-stin~ulants (control, trmsplanted rice (Oryza sfltiva L.) durillg fie only water spray, cytozylrie crop + 0.1% at the rainy season of 1988 at Jorhat, in split- 30 days after transplanting, triacolltanol plot design with 16 treatment combinations. 0.25% at 20 days ,7fter ~ansplanting and The treatments comprised 2 rice varieties paras photosynfi 2.5% at 25 days after (Mahsufi and Sol~ona) as main Plot, 4 transplanting) and 2 weed-cotitrol treatmentsReferences
Effect of growth-stimulants and weed control on transplanted rice (Oryza sativa) varieties
J. DEKA ANDN.N. SARMA
Departnlent of Agrononly, Assarli Agricultrrral Crniversity, .Jorlzat 785 013
Received: March 1992
Y A field experimeilt was conducted with treatments of growth-stin~ulants (control, trmsplanted rice (Oryza sfltiva L.) durillg fie only water spray, cytozylrie crop + 0.1% at the rainy season of 1988 at Jorhat, in split- 30 days after transplanting, triacolltanol plot design with 16 treatment combinations. 0.25% at 20 days ,7fter ~ansplanting and The treatments comprised 2 rice varieties paras photosynfi 2.5% at 25 days after ('Mahsufi' and 'Sol~ona') as main Plot, 4 transplanting) and 2 weed-cotitrol treatments
Table 1. Dry weight of weeds, growth, yield attributes and grain yield of rice varieties as affected by growth- stimulalits and weed control
Treatment Dry weight Plant No. of NG. of No. of 1,000 grain Grain .-.. of weeds height of tillers! pauiclesl grains1 weight (g) yield rq atharvest rice m2 m2 m2 (qw
Valicty 'Mahsuri' 78.14 102.97 65.81 141.42 137.79 20.36 33.57 'Solpona' 104.15 102.96 61.07 101.42 95.96 22.10 16.61 CD (P = 0.5) 2.48 NS 3.95 30.29 20.35 NS 3.85
Growth-stimulant
Water spray 90.66 105.27 62.03 112.58 106.17 21.22 23.39 Mixtalol0.25% at 96.15 104.79 61.15 132.42 126.33 21.46 29.11
DAT I_ Cytozyme crop +O.l% 91.85 102.76 61.17 117.75 114.25 21.01 22.86
DAT Triacontanol 80.25% 85.92 99.04 63.40 122.92 120.75 21.24 25.00
at 30 DAT CD (P=O.O5) NS NS NS NS NS NS 3.30
Weed co~~lrol
Weedy check 107.93 101.70 62.88 117.88 1 10.79 21.32 25.00
flutachlor @ 1.5 kg 74.36 104.22 61.00 124.96 122.96 21.15 25.18 aiiha 7 DAT
DAT. Days after trausplsnting
DEKA AND SARMA [Vol. 38, No. 4
(weedy check and butachlor grmules @ 1.5 panicle due to cytozyme crop + 0.1%. The kglha) as subplot treatments. Fertilizers in number of tillers and dry weight of weeds the form of urea, single superphosphate and were not affected by growth-stimulants. muriate of potash were applied @ 40,20 and Similar observations were recorded by 20 kg N, P,O, and $Olha respectively Srivastava and Sanna (1987). during puddling of rice field. The crop was Application of butachlor granules @ 1.5 harvested on 30 November. The soil of the kg sib at 7 days after transplanting caused experimental field was sandy loam with pH significant reduction in dry weight of weeds. 5.60, total N 0.053%, available P,O, 39.40 However, it could reflect in increase of yield kgha and available K20 62.20 kgha. attributes and yield of rice. It might be due
The variety 'Mahsuri' gave significantly to higher threshold limit of weed-dry weight, higher yield than 'Solpona' (Table I). which could have resulted in any significant Higher number of panicleslm2 and grainsl effect on rice. Weeds were effectively panicle resulted in higher grain yield suppressed during the vegetative growth of (Table 1). Higher tiller number and lower the crop due to puddling and continuous dry weed weight were recorded in 'Mahauri' submergent weeds emerging in the later rice. stage could not cause any damage to the crop
Among the growth-stimulants, lnixtalol already established. 0.25% applied 30 days after transplanting REFERENCE
resulted in significantly higher grain yield than triacoiitanol 0.25% and cytozyme crop Srivastava, H. C. and Sarma, H. C. 1987. Effect of mixtdol on rice. Trials in AndhraPradesh. (In)
+ 0.1%, both applied 30 days after
Crop Productivity. Srivastava, Bhaskaran, S. and
transplanting. This could be attributed to
Menon, K. K. G. @is) :Oxford & IBH Pbbliihing more number of panicles/mhd grainsl Co. Pvt. Ltd, New Delhi.
Itldian J. Agron. 38 (4) :646-648 (December 1993)
Effect of agronomic manupulations on yield of irrigated wheat
(Triticunt aestivunt)
R. S. LIDDER. M. P. JAIN ANDB.S. THAKUR
Zonal Agricu!tural Research Station, Jawaharlal Nehru Krishi Vishwa Vidyalaya,
Powarkhedo, Madl~ya Pradesh 461 110 Received: March 1992
A field experiment was conducted to find manipulations on the yield of wheat out the . effect of some agronomic (Triticum aestivum L. emend. Fiori & Paol.)
