Abstract
A field experiment was conducted from 2006-07 to 2008-09 at Punjab Agriculture University, Ludhiana, centre of AICRP on Cropping Systems to evaluate the effect of 10 crop sequences on productivity, profitability, weed population and soil fertility. Maximum rice ( Oryza sativa L.) equivalent yield was recorded by maize ( Zea mays L.)- potato ( Solanum tuberosum L.)-onion ( Allium cepa L.) (32.0 t/ha) followed by summer groundnut ( Arachis . hypogaea L )-potato-bajra ( Pennisetum glaucum L.) (fodder), and maize-potato-summer moongbean ( Vigna ra- diata L. Wilczek) cropping systems. These cropping systems produced an additional rice equivalent yield of 10.0 to 19.1 t/ha and saved 75.6 to 122.3 cm irrigation water over the rice-wheat system. The highest energy produc- tion was with maize-wheat ( Triticum aestivum (L.) Fiori & Paol]-moonngbean (43.7 X 106 K.cal) whereas the pro- duction efficiency (98.8 kg/day/ha) and net returns ( 1.65 105) were highest in maize-potato-onion cropping sys- tem. The population of Phalaris minor was lower in all the cropping systems when compared with the ricewheat system. The maize based cropping system showed positive influx of N, P and K over initial values.
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