G. Pratibha et al., INFLUENCE OF TILLAGE SYSTEMS AND OF PULSES AND OILSEEDS SUCCEEDING RICE (ORYZA-SATIVA) ON CHEMICAL-PROPERTIES OF SOIL, Indian Journal of Agricultural Sciences, 65(2), 1995, pp. 102-105
An experiment was conducted during the winter season of 1989-90 and 19
90-91 to study the effect of tillage practices on chemical properties
of the soil. The tillage practices were: T-1, no tillage; T-2, ploughi
ng twice with country plough; T-3, ploughing twice with bullock-drawn
mouldboard plough; T-4, ploughing once with tractor-drawn mouldboard p
lough; T-5, ploughing twice with cultivator; and T-6, ploughing once w
ith tractor-drawn mouldboard plough followed by rotovator twice. The u
pland crops grown in sequence with rice (Oryza sativa L.) were blackgr
am (Phaseolus mungo L.), groundnut (Arachis hypogaea L.), castor (Rici
nus communis L.) and sunflower (Helianthus annuus L.). Land preparatio
n in T-6 and T-4 recorded higher values of organic carbon (0.46%) and
available N, P and K content of soil during different stages df growth
of these upland crops. Organic C (0.55%) and available N (291.4 kg/ha
) were high, whereas available P was low in soils at harvest, especial
ly of groundnut, compared with those of other crops.