Evaluation of Pratilachlore, Penoxsulam and Pyrazosulfuron Herbicides on Persistence and Yield of Paddy Grown on a Vertisol
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Date
2013
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JNKVV
Abstract
Abstract
The present investigation were undertaken to know the in rotation and received pretilachlore 750 g a.i. ha-1, penoxsulam 25 g a.i. ha-1, and pyrazosulfuron 25 g a.i. ha-1, NPK @ 120:60:60, kg ha-ยน for the respective paddy crops, as per soil test value recorded at the start of the experiment. The fertilizers used are urea, di ammonium phosphate and murate of potash.
An experiment was conducted on Evaluation of pretilachlor, penoxsulam and pyrazosulfuron herbicide on persistence and yield of paddy grown on a vartisol. The study was carried out during Kharif season of 2012-2013 at experimental farm of Directorate of Weed Science Research, Jabalpur. The treatments included application of various herbicide applied to paddy crop @ pretilachlore 750 g a.i. ha-1, penoxsulam 25 g a.i. ha-1, and pyrazosulfuron 25 g a.i. ha-1 and weedy and hand weeding. The study was aimed to evalued the pattern of dissipation, persistence and residue in soil as well as in grain at harvest. The experiment was consisted of 5 treatment with 4 replications laid out in Randomized block design.
In the present study soil samples were collected from 0- 20 cm depth at initial, during crop growth of the crop with an interval of 0, 5, 10, 30, 60,90 days and at harvest. The samples were analyzed for physico-chemical parameters The result revealed that there is no variation was found in the values of soil pH and EC due to application of variable amount of herbicide Thus, the opinion that herbicide and inorganic fertilizers deteriorate the soil health is disapproved. On the other hand organic carbon content in the surface soil was found to be increased with application of different treatments at harvest was found between 6.0 to 7.4 g kg-1 and highest organic carbon was found in weedy plots. Similarly data on soil available nitrogen content at 60 days was found 237.79, 238.39, 241.46, 235.14, and 239.83 kg ha-1 in T1 (pretilachlor 750 g a.i. ha-1), T2 (penoxsulam 25 g a.i. ha-1), and T3 (pyrazosulfuron 25 g a.i. ha-1) treatments respectively. While, the available P content was found a range 10.75 to 34.66 (kg ha-1) in 0-20 cm soil surface layer in all the treatments. The highest content was recorded with application of penoxsulam treatments. However, similar trend was noted in the content of soil available soil K status. High sulphur content was recorded in herbicide treated plots (T2 penoxsulam 25 kg ha-1 and weed free plots (T5) in comparison to the weedy plots (T4).
As regarded to the observation on persistence residue and dissipation study reveals that higher content of residue was found in sample taken at initially as well as during growth period with an interval of 5 days exhibited successive depletion of herbicidal residue with progressive growth of the crop till harvest. HPLC method for detection for persistence residue and dissipation indicated that a first order kinetics was followed and the average half life values ranged for pretilachlor 750 g a.i. ha-1), T2 (penoxsulam 25 g a.i. ha-1), and T3 (pyrazosulfuron 25 g a.i. ha-1) were 15, 26 and 24 days respectively. It has also been found that residues of pretilachlor, penoxsulam and pyrazosulfuron were not detected in grain and straw sample of paddy at harvest.
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