A field experiment was carried out at Agricultural College Farm, Mahanandi in Kurnool district of Andhra Pradesh to study the effect of different levels of potassium and green manure on grain yield and soil properties of rice during Kharif, 2015. The results revealed that EC and pH at harvest of the crop were not significantly influenced by various treatments. The grain yield, organic carbon, available N, P 2 O 5 and K 2 O were significantly increased with increase in K fertilizer application and also due to green manure incorporation. Application of green manure in combination with K fertilizer recorded higher in above mentioned parameters than when applied alone. Among all the treatments, the highest grain yield, organic carbon, available N, P 2 O 5 and K 2 O status of soil were obtained with incorporation of green manure (Dhaincha) (GM)+120 kg K 2 O ha-1 which was on par with GM+80 kg K 2 O ha-1 and GM+40 kg K 2 O ha-1 .
A field experiment was carried out at Agricultural College Farm, Mahanandi in Kurnool district of Andhra Pradesh to study the effect of different levels of potassium and green manure on yield, dry matter production, content, uptake of potassium, available K and potassium use efficiency of rice during kharif 2015. The results revealed that the yield, dry matter production, content, uptake of potassium, available K and potassium use efficiency were significantly increased with increase in K fertilizer application and also due to green manure incorporation. The highest yield, dry matter production, content and uptake of potassium, available K were obtained with incorporation of green manure (Dhaincha @ 5 t ha-1) +120 kg K2 O ha-1 which was on par with (Dhaincha @ 5 t ha-1) +80 kg K2 O ha-1and (Dhaincha @ 5 t ha-1)+40 kg K2 O ha-1. Among all the treatments the highest KUE was observed with T6 ((Dhaincha @ 5 t ha-1) +40 kg K2 O ha-1) followed by T7 ((Dhaincha @ 5 t ha-1) + 80 kg K2 O ha-1) and T8 ((Dhaincha @ 5 t ha-1) +120 kg K2 O ha-1). Among the levels of K fertilizer, the highest potassium use efficiency was recorded at 100% RDK (80 kg K2 O ha-1) followed by 150% RDK (120 kg K2 O ha-1)
A reconnaissance soil survey was undertaken in Jammalamadugu -Proddutur tract of Pennar river basin in YSR Kadapa district, Andhra Pradesh to evaluate the suitability of soils for growing rice, cotton, bengalgram and sunflower crops. The soil belongs to Inceptisols, Entisols and Vertisols. All the pedons (P1 to P11) were marginally suitable for growing crops suchas rice, cotton, sunflower and bengalgram except P1 which is moderately suitable for growing cotton. Soil texture, pH and organic carbon, CaCO3 and drainage are the major limitations for crop growth in all the pedons. In general, the limitation levels of the land characteristics varied from crop to crop. The suitability classes for major crops can be improved if soil fertility characteristics are altered through soil amelioration measures. The actual and potential suitability classes of the soils also varied depending upon kind of limitations. If the limitation is due to properties like slope, erosion etc., it can be rectified or improved by adopting suitable soil and water conservation measures and introducing lifesaving irrigations but if the limitations are of permanent type like soil depth it is impossible to convert those lands into better suitability classes than the prevailing one.
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