STUDIES ON THE PRODUCTIVITY AND NITROGEN USE EFFICIENCY OF MAIZE + SOYBEAN INTERCROPPING SYSTEM AT DIFFERENT LEVELS OF NITROGEN.

ANDHRA Pradesh (India); INDIA

The experiment was conducted at Regional Agricultural Research Station, Nandyal, Andhra Pradesh during rabi 2007 and 2008 to study the productivity and nitrogen use efficiency of maize + soybean intercropping system at different levels of nitrogen. The results revealed that different systems significantly influenced the MGEY in both the years of study. Pooled data on maize grain equivalent yields indicate that soybean: maize in 2:1 ratio recorded significantly higher MGEY (2648 kg/ha) which was comparable with sole maize (2563kg/ha). Similarly, application of 100% N produced significantly higher MGEY (2424 kg/ha) than other levels of N fertilization while the lower MGEY (1803 kg/ha) were produced with control. Higher mean net returns were obtained with sole maize (Rs.12504/ ha.) closely followed by maize + soybean in 1:2 ratio (Rs.12009/- ha.). Among the N levels, 100% RDN realized an amount of Rs.10,888/- ha. followed by 75% RDN with net returns of Rs.9756/-. [ABSTRACT FROM AUTHOR]

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