Decomposition and nutrient release from maize (Zea mays L.) residue and N uptake by groundnut (Arachis hypogen)
1998
Mubarak, A.R. | Rosenani Abu Bakar | Siti Zauyah Darus | Anuar Abdul Rahim | Norhayati, A.
Incorporation of crop residue in agricultural system is an important factor in the control of soil fertility and nutrient cycling and may contribute significant amounts of nitrogen to the main crop. Decomposition of maize residue with or without chicken dung and nutrient release (N,P,K,Ca and Mg)were studied during the follow and growth period of groundnut. Dry matter weight loss (DMWL) was fast in the initial two weeks. Generally, decomposition was best described using the single exponential model with rate constants (k) of 0.1012 (square r = 0.95) and 0.106 (square r = 0.92) week E-1 with 50 % DMWL at 6.1 abd 5.9 weeks from residue and residue with chicken dung, respectively. Nutrient release was in the order of (fast to slow) KN=PMgCa. Residue incorporation slightly increased fresh pods yield and significantly increased N uptake. Groundnut growth curve showed a period of active growth measured in terms of dry matter and N accumulation to be confined to the period between 3rd and 9th weeks after sowing. Total soil mineral nitrogen (NH subscript 4 +-N and NO subscript 3- -N)after residue decomposition showed maximum accumulation (65ug/g, in the top 00-20 cm) at the 8th week. These results indicate a great potential for synchrony between N release and uptake.
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