Journal of FARM SCIENCES, Vol 28, No 2 (2015)

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Studies on changes in soil fertility, maize equivalent yield and nutrient recycling in different maize (Zea mays L.) based intercropping systems

G.K. Girijesh, A.S. Kumar Swamy, S.P. Nataraju

Abstract


Field experiments were conducted for two consecutive kharif seasons to find out the effect of different intercrops with maize on soil fertility and nutrient recycling in maize. The experiment consisted of 18 treatments, involving sole crop of maize at uniform row spacing (URS) and in paired row system (PR), sole crop of different intercrops and  intercropping system treatments in paired row system (45-75-45 cm) as additional series. Increase in soil pH and EC was noticed due to introduction of pulses in maize as intercrops. Significantly higher soil organic carbon was observed in plots grown with sole crop of pulses. Even the intercrop treatments recorded significantly higher soil organic carbon than sole crop of maize. The highest organic carbon content was recorded in the plots with maize + field bean var. local (0.573) followed by maize + red gram. Litter fall due to introduction of pulses justify the changes in organic carbon status. Higher available nitrogen was observed in plots with sole stands of intercrops (pulses) as compared to sole crop of maize as well as respective intercrop treatments. Intercrop treatments were also recorded significantly higher available nitrogen than sole maize.  Among the intercrop treatments, maize + local field bean (263.3 kg ha-1) and maize + red gram var. BRG-1 (257.5 kg ha-1) recorded higher available N. The available soil P recorded with sole crop of intercrops was higher than that under respective maize based intercropping systems. Further, plots under intercrop treatments also registered higher available P than sole maize plot. It was observed that the sole crop of field bean var. local (321.3 kg ha-1), maize + field bean var. local (276.8 kg ha-1), French bean (grain) (270.5 kg ha-1) recorded significantly higher available soil K than sole crop of maize (247.9 kg ha).


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