+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Alley cropping of maize with calliandra and leucaena in the subhumid highlands of Kenya: Part 2. Biomass decomposition, N mineralization, and N uptake by maize



Alley cropping of maize with calliandra and leucaena in the subhumid highlands of Kenya: Part 2. Biomass decomposition, N mineralization, and N uptake by maize



Agroforestry Systems 46(1): 51-64



A major challenge in developing agroforestry approaches that utilize tree-leaf biomass for provision of N to crops is to ensure synchrony between the N released from decomposing prunings and N demand by crops. A study was conducted in the subhumid highlands of Kenya to assess the rate of decomposition and mineralization of soil-incorporated Calliandra calothyrsus Meissner (calliandra) and Leucaena leucocephala (Lam.) de Wit (leucaena) tree biomass and maize roots (Zea mays L.) both in an alley cropping and a sole cropping system. The amount of mineralized N peaked four weeks after planting (WAP) maize in all the treatments during both seasons of 1995. Cumulative mineralized N at week 20 ranged from 114 to 364 kg N ha-1 season-1, the absolute control treatment giving the lowest and the prunings-incorporated treatments giving the highest amounts in the two seasons. Total N uptake by maize, ranging from 42 to 157 kg ha-1 season-1, was lowest in the 'alley-cropped, prunings-removed' treatments, and highest in the 'non alley-cropped, prunings-incorporated' treatments. The apparent N recovery rate by maize was highest in the fertilizer applied treatments in the two seasons. Decomposition rate constants (kD) ranged from 0.07 to 0.21 week-1, and the rates among the different plant residues were as follows: leucaena > calliandra > maize roots. Nitrogen release rate constants (kN), ranging from 0.04 to 0.25 week-1, followed a similar pattern as the rate of decomposition with leucaena releasing the highest amount of N followed by calliandra and lastly by maize roots.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 010145032

Download citation: RISBibTeXText

DOI: 10.1023/a:1006269217882


Related references

Alley cropping of maize with calliandra and leucaena in the subhumid highlands of Kenya. 2. Biomass decomposition, N mineralization, and N uptake by maize. Agroforestry systems an international journal6(1): 51-64, 1999

Alley cropping of maize with calliandra and leucaena in the subhumid highlands of Kenya: Part 1. Soil-fertility changes and maize yield. Agroforestry Systems 46(1): 39-50, 1999

Alley cropping of maize with calliandra and leucaena in the subhumid highlands of Kenya. 1. Soil-fertility changes and maize yield. Agroforestry systems an international journal6(1): 39-50, 1999

Nitrogen recovery by alley-cropped maize and trees from 15N-labeled tree biomass in the subhumid highlands of Kenya. Biology and Fertility of Soils 31(2): 97-101, 2000

Tree-biomass decomposition, nitrogen dynamics, and maize growth under agroforestry conditions in the subhumid highlands of Kenya. 1997

Economic evaluation of alley cropping leucaena leucaena leucocephala with maize maize and maize cowpea in southern nigeria. Agricultural Systems 17(4): 243-258, 1985

Leucaena + maize alley cropping in Malawi. Part 1: effects of N, P, and leaf application on maize yields and soil properties. Agroforestry Systems 33(3): 281-294, 1996

Leucaena and maize alley cropping in Malawi. Part 1: Effects of N, P, and leaf application on maize yield and soil properties. Agroforestry Systems 33(3): 281-294, 1996

Leucaena and maize alley cropping in Malawi. Part 2: Residual P and leaf management effects on maize nutrition and soil properties. Agroforestry Systems 33(3): 295-305, 1996

Leucaena + maize alley cropping in Malawi. Part 2: residual P and leaf management effects on maize nutrition and soil properties. Agroforestry Systems 33(3): 295-305, 1996

Economic evaluation of alley cropping Leucaena with maize - maize and maize - cowpea in Southern Nigeria. Agricultural Systems 17(4): 243-258, 1985

Vector competition analysis of a Leucaena-maize alley cropping system in western Kenya. Forest Ecology and Management 126(2): 255-268, 2000

Alley cropping on an Ultisol in subhumid Benin. Part 3: Nutrient budget of maize, cassava and trees. Agroforestry Systems 37(3): 213-226, 1997

The influence of rainfall distribution on the yield of maize under Leucaena leucocephala alley cropping at Mtwapa, Coast Province, Kenya. Meteorology and agroforestry Proceedings of an international workshop on the application of meteorology to agroforestry systems planning and management, Nairobi 9-13 February 1987: 383-389, 1989

Alley cropping on an Ultisol in subhumid Benin. Part 1: Long-term effect on maize, cassava and tree productivity. Agroforestry Systems 34(1): 1-12, 1996