Study on the Soil Available Phosphorus as Affected by Multiple Cropping

Available phosphorus in the soil as affected by various multiple cropping sequences for six consecutive seasons was studied from an experiment conducted at the Central Rice Research Institute. Cut tack. It was found that the available phosphorus of the cultivated layer of the soil (0 to 15 cm) increased after potato, maize and groundnut, the increase being greatest after the potato crop. There was slight decrease after the succeeding dalua rice, but it increased again after the kharif rice. In continuous cropping of rice, the same trend was observed.