Crop yield, C and N balance of three types of cropping systems on an Ultisol in Northern Lampung

Abstract

Three types of cropping systems, cassava-based intercropping, hedgerow intercropping and legume cover crop rotations, were evaluated in 1994-1997 in Northern Lampung, Sumatra (Indonesia). The C and N flows returned within and transported out of plots and crop yields of different cropping systems were quantified. Cassava-based systems were not stable and yields declined over time. Intercropping cassava with rice increased cassava fresh tuber weight by 5-48% compared to the monocropping system. The hedgerow intercropping gave lower maize, rice, groundnut and cowpea yields than could be obtained in a crop rotation with legume cover crops. Maize grain yields in the 80-20 rice/maize mixture were ~ 0.4 t ha-1 in the rice - groundnut rotation and about half as much when intercropped with cassava or hedgerows. Rice yields intercropped with cassava or with hedgerows were ~1 t ha-1 less in year 2 and 3 than those grown in rotation with groundnut. The rice yield in the first cropping season was only ~1 t ha-1, but in the second and third year yields in the rice - legume rotation increased to ~2 and 3 t ha-1, respectively. This increase occurred despite a decline in soil organic matter content. The cassava-based systems removed much more C (7 t ha-1 yr-1) than the other systems, while less was returned (~0.5-2 t ha-1) to the soil. In the hedgerow intercropping system ~2.5 t C ha-1 yr-1 was returned to the plot as biomass pruning and crop residues and ~1.5 t C ha-1 yr-1 was removed from the plot as yield. In the cover crop rotation 2.6 t C ha-1 yr-1 was returned to the plot as crop residues plus Mucuna (only the 2nd year) and cowpea biomass, and ~1.1 t ha-1 yr-1 was removed from the plot. The hedgerow intercropping systems gave an N surplus of ~15-50 kg ha-1 yr-1 returned to the soil; while the balance was 10-20 kg ha-1 yr-1 for the cover crop rotation systems, and the cassava-based systems showed a negative N budget of ~60 kg ha-1 yr-1.

Citation

Netherlands Journal of Agricultural Science (2000) 48 (1) 3-17

Crop yield, C and N balance of three types of cropping systems on an Ultisol in Northern Lampung

Help us improve GOV.UK

Don’t include personal or financial information like your National Insurance number or credit card details.