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Interspecific Interaction and Nutrient Use in Soybean/Sorghum Intercropping System

^a ICAR Research Complex for NEH Region, Umiam, Meghalaya 793103
^b Indian Inst. of Soil Sci., Nabibagh, Berasia Rd., Bhopal, Madhya Pradesh, India 462038

View larger version (19K): [in a new window]   Fig. 1. Total monthly rainfall from January 2000 to December 2004 and the 22-yr average near the experimental site on the research farm of the Indian Institute of Soil Science, Bhopal, India.

View larger version (9K): [in a new window]   Fig. 2. Sketch of soybean/sorghum intercrop row (each spacing of 30 cm) pattern.

View larger version (47K): [in a new window]   Fig. 3. (a) Crop growth rate and (b) chlorophyll content of soybean and sorghum under sole and intercropping under various nutrient management. Data following common letters are not significantly different at 5% probability as per Duncan's multiple range tests. H, harvest; FYM, farmyard manure; PC, phosphocompost; PM, poultry manure.

View larger version (61K): [in a new window]   Fig. 4. Trends in nitrate reductase activity (NRA) in sole and intercropping under different nutrient management. Data following common letters are not significantly different at 5% probability as per Duncan's multiple range tests. FW, fresh weight; FYM, farmyard manure; PC, phosphocompost; PM, poultry manure.

View larger version (53K): [in a new window]   Fig. 5. Trend in (a) shoot biomass, (b) N uptake, and (c) photosynthesis rate in middle rows of soybean and rows adjacent to sorghum. Data following common letters are not significantly different at 5% probability as per Duncan's multiple range tests. FYM, farmyard manure; PC, phosphocompost; PM, poultry manure.

View larger version (46K): [in a new window]   Fig. 6. Trends in (a) root length density, (b) root biomass, and (c) nodule mass of middle rows of soybean and rows adjacent to sorghum. Data following common letters are not significantly different at 5% probability as per Duncan's multiple range tests. FYM, farmyard manure; PC, phosphocompost; PM, poultry manure.

View larger version (42K): [in a new window]   Fig. 7. Root length density of sole and intercrop of soybean and sorghum as influenced by nutrient management. Data following common letters are not significantly different at 5% probability as per Duncan's multiple range tests. FYM, farmyard manure; PC, phosphocompost; PM, poultry manure.