EVALUATION OF NEW POST EMERGENCE HERBICIDES IN TRANSPLANTED RICE

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dc.contributor.advisorSRINIVASULU, K
dc.contributor.authorVANAJA, THOTA
dc.date.accessioned2016-06-03T09:30:23Z
dc.date.available2016-06-03T09:30:23Z
dc.date.issued2011
dc.description.abstractA field experiment entitiled “Evaluation of new post-emergence herbicides in transplanted rice” was conducted during Kharif 2009 on sandy clay loam soil of Agricultural College Farm, Bapatla, Guntur district, Andhra Pradesh. The experiment was laid out in a randomized block design and replicated four times with eight treatments comprising of T1: Weedy check; T2: Hand weeding at 20 and 40 DAT; T3: Oxadiargyl 80 WP @ 100 g a.i. ha-1 at 3 to 5 DAT; T4 Bispyribac sodium 10 SC @ 30 g a.i. ha-1 at 20 DAT; T5: Azimsulfuron 50 DF @ 30 g a.i. ha-1 at 20 DAT; T6: Penoxsulam 24 SC @ 20 g a.i. ha-1 at 20 DAT; T7: 2,4-D amine salt 58 SL @ 0.58 kg a.i. ha-1 at 20 DAT; T8: Pyrazosulfuron ethyl 10 WP @ 20 g a.i. ha-1 at 20 DAT. The results of the investigation revealed that pre-emergence application of oxadiargyl 80 WP @ 100 g a.i. ha-1 (T3) applied at 4 DAT recorded lowest weed dry matter at 20 DAT. Hand weeding at 20 and 40 DAT (T2) was on a par with emergence application of oxadiargyl 80 WP @ 100 g a.i. ha-1 at 4 DAT (T3). pre- Hand weeding at 20 and 40 DAT (T2) recorded significantly higher weed control efficiency over all other pre and post-emergence herbicides at all crop growth stages, except at 20 DAT, whereas pre-emergence application of oxadiargyl 80 WP @ 100 g a.i. ha-1 at 4 DAT (T3) rerecorded highest weed control efficiency at 20 DAT. All growth parameters such as plant height, number of tillers per m-2, and drymatter accumulation by crop measured at different growth stages were significantly affected by the weed management treatments. Consistently better growth was observed at all the stages with hand weeding at 20 and 40 DAT (T2) except at 20 DAT. At all other stages hand weeding at 20 and 40 DAT (T2) recorded highest plant height followed by pre-emergence application of oxadiargyl 80 WP @ 100 g a.i. ha-1 (T3) and there was no significant difference among all other herbicides which were on a par with each other throughout the crop growth period. The highest drymatter accumulation by rice crop was registered with hand weeding (T2) followed by penoxsulam 24 SC @ 20 g a.i. ha-1 (T6) at all the stages of crop growth, except at 20 and 80 DAT, where oxadiargyl 80 WP @ 100 g a.i. ha-1 at 4 DAT recorded the highest plant drymatter at 20 DAT and hand weeding at 20 and 40 DAT (T2) recorded highest drymatter by rice crop at 80 DAT. The differences observed in growth parameters among the treatments studied also reflected the trend with that of yield attributes. The number of productive tillers m-2 observed with bispyribac sodium 10 SC @ 30 g a.i. ha-1 was markedly higher than the weedy check. However, the number of productive tillers m-2 observed with various herbicides were comparable with that of hand weeding. Maximum number of filled grains per panicle were observed with the hand weeding at 20 and 40 DAT. The number of grains per panicles observed with the penoxsulam 24 SC @ 20 g a.i. ha-1 and oxadiargyl 80 WP @ 100 g a.i. ha-1 were markedly higher than that of weedy check. The grain and straw yields observed with oxadiargyl 80 WP @ 100 g a.i. ha-1 and penoxsulam 24 SC @ 20 g a.i. ha-1 were comparable with hand weeding at 20 and 40 DAT, which recorded the highest grain (6227 kg ha-1) and straw (7331 kg ha-1) yields. Highest net returns (Rs. 48183 ha-1) was recorded with the post-emergence application of penoxsulam 24 SC @ 20 g a.i. ha-1 followed by pre-emergence application of oxadiargyl 80 WP @ 100 g a.i. ha-1. Thus, the present investigation clearly indicated that post-emergence application of penoxsulam 24 SC @ 20 g a.i. ha-1 at 20 DAT (T6) or pre-emergence application of oxadiargyl 80 WP @ 100 g a.i. ha-1 at 4 DAT (T3) were found to be effective in controlling weeds and increased rice productivity as well as economic returns in transplanted rice.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/66677
dc.language.isoenen_US
dc.publisherACHARYA N. G. RANGA AGRICULTURAL UNIVERSITYen_US
dc.relation.ispartofseriesD9018;
dc.subAgronomy
dc.subjectweeds, control methods, rice, herbicides, developmental stages, yields, crops, planting equipment, grain, dryingen_US
dc.subjectHERBICIDES, TRANSPLANTED RICEen_US
dc.these.typeM.Sc
dc.titleEVALUATION OF NEW POST EMERGENCE HERBICIDES IN TRANSPLANTED RICEen_US
dc.typeThesisen_US
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