RESUMO
To evaluate the “Correlation and regression of weed, growth and yield attributes of transplanted Pearl millet (Pennisetum glaucum (L.) R. Br. Emend. Stunz) as affected by weed management practices”. And the design of the trial was Randomized Complete Block Design (RBD).The field trial was conducted during the Rabi season 2022 at Experimental farm, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu. The experiment consisted of eight different treatments for weed management practices was replicated thrice. The soil type used was silty clay loam. The Pearl millet TNAU cumbu hybrid (CO9) was sown in the nursery and transplanted at 18 DAS and transplanted with a spacing of 45 x 15 cm. The following treatments were applied: T1 - PE of Atrazine 0.5 kg ha-1, T2 - PE of Oxyflurofen 0.250 kg ha-1, T3 - PE of Pendimethalin 0.75 kg ha-1, T4 - T1+ Hand Weeding on 30 DAT, T5 - T2+ Hand Weeding on 30 DAT, T6 - T3+ Hand Weeding on 30 DAT, T7 - Hand Weeding on 20 and 40 DAT and T8 - Unweeded check. Correlation analysis in weed management research assists researchers in assessing the strength and direction of relationships between variables. By understanding these relationships, researchers can gain insights into the factors influencing weed growth and develop focused management strategies. Moreover, correlation and regression studies provide valuable information for decision-making in weed management. The analysis showed positive correlation between grain yield and growth parameters viz., plant height at harvest (r = 0.965), LAI at 45 DAT (r = 0.852), DMP at 45 DAT (r = 0.971) and DMP at harvest (r = 0.973). Grain yield showed positive correlation with yield attributes, WCE and nutrient content viz., Productive tillers (r = 0.987), test weight (r =0.994), stover yield (r = 0.981), Weed Control Efficiency (r = 0.931), nitrogen uptake (r = 0.980), phosphorous uptake (r = 0.979) and potassium uptake (r = 0.962).This information can guide farmers, agronomists, and policymakers in making informed choices regarding management practices, resource allocation, and minimizing the economic and environmental impacts of weeds.
RESUMO
Aims: To evaluate the “Correlation and Regression Studies of Growth, Yield Attributes and Yield of foxtail millet (Setaria italica L.) Under Different Varieties and Landraces”.Place and Duration of Study: The experiment was carried out in the Rabi season of 2022-23 at Experimental farm in Karunya Institute of Technology and Sciences, Coimbatore. Experimental field was silty clay loam in texture with medium in available N (273.0 kg/ha), high in available P2O5 (21.5 kg/ha) and high in available K2O (425.0 kg/ha) and lower level of organic carbon (0.29%).Study Design: Randomized Block Design (RBD).Methodology: The treatments consisted of 8 foxtail millet varieties and landraces viz., T1 - ATL-1 (Control), T2 - SiA-3222 (Garuda), T3 - SiA-3088 (Suryanandhi), T4 - SiA-3085, T5 - SiA-3156, T6 - SiA-3233 (Reynaudu), T7 - Mookanthathinai and T8 - Koranthinai.Results: Grain yield was highly significant positive correlation with N uptake (r = 0.996**), DMP at harvest stage (r = 0.984**), K uptake (r = 0.981**), P uptake (r = 0.966**) and straw yield (r = 0.954**). From the regression, N uptake (R2 = 0.993**), DMP (R2 = 0.968**) at harvest is the important positive component of grain yield in foxtail millet followed by K uptake (R2 = 0.962**), P uptake (R2 = 0.934**) and straw yield (R2 = 0.911**).Conclusion: From the result of correlation and regression, it was concluded that in terms of grain yield, the foxtail millet varieties and landraces are influenced by the DMP at harvest stage, N uptake, K uptake, P uptake and Straw yield.
RESUMO
Aim: To evaluate the “Correlation and Regression Studies of Growth, Yield Attributes and Yield of finger millet under different weed management.” Study Design: Randomized Complete Block Design (RBD). Place and Duration of Study: The field trial was conducted during the Rabi season of 2021-22 at Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu. The experimental field had a silky clay loam soil composition. Methodology: The field trial comprised of eight treatments and was replicated three times. In the experimental farm, the variety Paiyur 2 was grown into nursery and transplanted at 25th day with the spacing of 30 × 15 cm and followed the all other agronomic practices. To experimented the following treatments viz., T1- PE of pretilachlor at 1.0 kg ha-1,T2- PE of pretilachlor at 0.75 kg ha-1+ one hand weeding on 35th DAT, T3- PE of pendimethalin at 0.5 kg ha-1,T4- PE of pendimethalin at 0.5 kg ha-1+ one hand weeding on 35th DATP, T5- PE of Butachlor at 1.0 kg ha-1,T6- PE of Butachlor at 0.75 kg ha-1+ one hand weeding on 35th DAT, T7- POE of 2,4-D at 2 kg ha-1on 35 th DAT, T8- POE of 2,4-D at 2 kg ha-1+ one hand weeding on 35th DAT, T9- Two hand weeding at 35 DAT and 70 DAT, T10- Unweeded check. The biometric observations were recorded at three specific time points: 35 DAT, 70 DAT, and at harvest stage. Results: The grain yield was highly significant positive correlation with Straw yield (r = 0.893), Leaf area index (r =0.975), Dry matter accumulation at 70 DAT (r=0.966), Dry matter accumulation at harvest (r =0.966), Productive tillers (r =0.902), Test weight (r =0.903), Weed control efficiency (r =0.797), Nitrogen uptake (r =0.980), Phosphorus uptake (r =0.972), Potassium uptake (r =0.960). However, significant positive correlation with Plant height (r =0.733). From the regression every unit increase in stover yield, plant height, LAI at 70 DAT, crop dry matter at 70 DAT, crop dry matter at harvest, number of productive tillers plant-1, test weight, Weed Control Efficiency and N, P and K uptake by crop substantially increased the grain yield by 0.798, 0.537, 0.951, 0.932, 0.992, 0.812, 0.865, 0.635, 0.960, 0.944 and 0.920 kg ha-1 respectively.