Abstract
Reduction in forage production (FP) under trees in the humid tropics is well known, but information on how different levels of nitrogen (N) fertilizer influence FP under trees is meager. The present study reports effects of four N fertilizer levels (0, 60, 80 and 120 kg ha−1 N) on net soil N mineralization rate (NMR) and soil moisture (SM), FP, shoot biomass/root biomass ratio (SB/RB), N concentration in SB, N uptake and nitrogen use efficiency (NUE) of three grasses [guinea (Panicum maximum Jacq.), para (Brachiaria mutica (Forssk) Stapf) and hybrid-napier (Pennisetum purpureum Schumach.)] under three canopy positions [under canopy (UC, representing high shade), between canopy (BC, representing low shade) and open] of coconut trees (Cocos nucifera L.) in a coconut based silvopastoral system in the humid tropical climate of South Andaman Island of India. The study was performed for two annual cycles (2005–2006 and 2006–2007). The hypotheses tested were: (1) FP would decline under tree shades, both in N fertilized as well as no N fertilized conditions, when SM was not growth limiting in the open. However, amount of decline in the FP would depend on grass species and intensity of shades i.e., higher was the shade greater would be the decline; (2) N fertilizer would increase FP under tree shades, but the increase depended on grass species, intensity of shades and amount of N applied. Amount of N applied, however, would not annul the shades effects when SM was not growth limiting in the open. The study revealed that the tree reduced light 59% under UC and 32% under BC positions, but the N fertilizer levels increased NMR by 11–51% under UC and 3–44% under BC positions compared to the open. SM did not differ across the canopy positions. Under all situations, FP of all grasses declined under UC (47–78%) and BC (18–32%) positions compared to the open; the decline was greater in Hybrid-napier than Guinea and Para grasses. Forage production of all grasses increased with N fertilizer increments under all canopy positions reaching 32 t ha−1 dry matters for hybrid-napier at 120 kg ha−1 N in the open. Both guinea and para grasses outyielded hybrid-napier grass under UC but not under BC or in the open. N concentration in the forage (SB) also increased as N fertilizer level increased. These observations support our hypotheses and suggest that forage production under coconut palms can be increased by the application of N fertilizer with both guinea and para grasses being more productive than hybrid-napier grass under the high shade. Where light conditions are better, hybrid-napier would produce more forage than the other species.
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References
Anderson LJ, Brumbaugh MS, Jackson RB (2001) Water and tree-understorey interactions: a natural experiment in a savanna with oak wilt. Ecology 82:33–49
Arun MN, Ahlawat SPS, Sharma AK (1993) Fodder in view of livestock farming in the Andaman Islands. Isl March 6(1):4–7
Basic Statistics (2001) Andaman and Nicobar Islands: basic statistics. Directorate of Economics and statistics, Andaman and Nicobar Administration, Port Blair
Baumeister D, Callaway RM (2006) Facilitation by Pinus flexilis during succession:a hierarchy of mechanisms benefits other plant species. Ecology 87:1816–1830
Belsky AJ (1994) Influence of trees on savanna productivity: test of shade, nutrients, and tree-grass competition. Ecology 75:922–932
Belsky AJ, Amundson RG, Duxbury JM, Riha SJ, Ali AR, Mwonga SM (1989) The effects of trees on their physical, chemical and biological environment in a semi-arid savanna in Kenya. J Appl Ecol 26:1005–1024
Benavides R, Douglas GB, Osoro K (2009) Silvopastoralism in New Zealand: review of effects of evergreen and deciduous trees on pasture dynamics. Agrofor Syst 76:327–350
Bremner JM (1965) Total nitrogen 8. In: Black A (ed) Methods of soil analysis, agronomy 9. Part 2. American Society of Agronomy, Madison, WI, pp 1149–1179
Burner DM, MacKown CT (2006) Nitrogen effects on herbage nitrogen use and nutritive value in a meadow and Loblolly pine alley. Crop Sci 46:1149–1155
Callaway RM, Walker LR (1997) Competition and facilitation: a synthetic approach to interactions in plant communities. Ecology 78(7):1958–1965
Callaway RM, Brooker RW, Choler P, Kikvidze Z, Lortie CJ, Michalet R, Paolini L, Pugnaire FI, Newingham B, Aschehoug ET, Armas C, Kikodze D, Cook BJ (2002) Positive interactions among alpine plants increase with stress. Nature 417:844–848
Cruz P (1996) Growth and nitrogen nutrition of a Dichanthium aristatum pasture under shading. Trop Grassl 30:407–413
Cruz P, Munier-Jolain NM, Tournebize R, Sinoquet H (1993) Growth and mineral nutrition in a Dichanthium aristatum sward shaded by tree. In: Proceedings of the XVII International Grassland Congress, Rockhampton, pp 2056–2057
Cruz P, Tournebize R, Gaudichau C, Haegelin A, Munier-Jolain NM (1995) Effect of shade on growth, nitrogen content and CO2 leaf assimilation in a tropical perennial grass. In: Sinoquet H, Cruz P (eds) Ecophysiology of tropical intercropping. INRA, Paris, pp 285–293
Delogu G, Cattivelli L, Pecchioni N, DeFalcis D, Maggiore T, Stanca AM (1998) Uptake and agronomic efficiency of nitrogen in winter barley and winter wheat. Eur J Agron 9:11–20
Dodd MB, McGowan AW, Power IL, Thorrold BS (2005) Effects of variation in shade level, shade duration and light quality on perennial pasture. NZJ Agirc Res 48:531–543
Durr PA, Rangel J (2000) The response of Panicum maximum to a simulated subcanopy environment: soil × shade interaction. Trop Grassl 34:110–117
Eno CF (1960) Nitrate production in the field by incubating the soil in polyethylene bags. Soil Sci Soc Am Proc 24:277–279
Eriksen FI, Whitney AS (1981) Effects of light intensity on growth of some tropical forage species. I. Interaction of light intensity and nitrogen fertilization on six forage grasses. Agron J 73:427–433
Field C (1983) Allocating leaf nitrogen for maximization of carbon gain: leaf age as a control on the allocation program. Oecologia 56:341–347
Gea-Izquierdo G, Montero G, Canellas I (2009) Changes in limiting resources determine spatio-temporal variability in tree-grass interactions. Agrofor Syst 76:375–382
Grossman D, Grunow JO, Theron GK (1980) Biomass cycling, accumulation rates and nutritional characteristics of grass layer plants in canopied and uncanopied subhabitats of Burkea savanna. Proc Grassl Soc South Africa 15:157–161
Guevara-Escobar A, Kemp PD, Mackay AD, Mackay AD, Hodgson J (2007) Pasture production and composition under poplar in a hill environment in New Zealand. Agrofor Syst 69:199–213
Heggenstaller AH, Moore KJ, Liebman M, Anex RP (2009) Nitrogen influences biomass and nutrients partitioning by perennial, warm-season grasses. Agron J 101:1363–1371
Hiremath AJ, Ewel JJ, Cole TG (2002) Nutrient use efficiency in three fast growing tropical trees. Forest Sci 48:662–672
Koukoura Z, Nastis AS (1989) Effect of shade on production and forage quality of herbaceous species. Geotehnika Epistimonika Themata 1:17–25 (In Greek, English summary)
Koukoura Z, Kyriazopoulos AP, Parissi ZM (2009) Growth characteristics and nutrient content of some herbaceous species under shade and fertilization. Spanish J Agric Res 7(2):431–438
Ludwig F, de Kroon H, Berendse F, Prins HHT, Berendse F (2001) The effects of nutrients and shade on tree-grass interactions on an East African savanna. J Veg Sci 12:579–588
Ludwig F, de Kroon H, Berendse F, Prins HHT (2004) The influence of savanna trees on nutrient, water and light availability and the understory vegetation. Plant Ecol 170:93–105
Michon G, Mary F, Bompard J (1986) Multistoried agroforestry garden system in West Sumatra, Indonesia. Agrofor Syst 4:315–338
Millate-E-Mustafa MD, Hall JB, Teklehaimanot Z (1996) Structure and floristics of Bangladesh homegardens. Agrofor Syst 33:263–280
Mordelet P, Menaut JC (1995) Influence of trees on aboveground production dynamics of grasses in a humid savanna. J Veg Sci 6:223–228
Mosquera-Losada MR, Lopez-Diaz L, Rigueiro-Rodriguez A (2001) Sewage sludge fertilization of a silvopastoral system with pines in northwestern Spain. Agrofor Syst 53:1–10
Pandey CB, Singh JS (1992) Rainfall and grazing effects on net primary productivity in a tropical savanna, India. Ecology 73:2007–2021
Pandey CB, Singh L (2009) Soil fertility under homegarden trees and native moist evergreen forest in South Andaman, India. J Susta Agric 33(30):303–318
Pandey CB, Rai RB, Singh L (2007a) Seasonal dynamics of mineral N pools and N-mineralization in soils under homegarden trees in South Andaman, India. Agrofor Syst 71:57–66
Pandey CB, Rai RB, Singh L, Singh AK (2007b) Homegardens of Andaman and Nicobar, India. Agric Syst 92:1–22
Pandey CB, Singh GB, Singh SK, Singh RK (2010) Soil nitrogen and microbial biomass carbon dynamics in native forests and derived agricultural land uses in a humid tropical climate of India. Plant Soil 333:453–467
Polley HW, Johnson HB, Mayeux HS (1997) Leaf physiology, production, water use, and nitrogen dynamics of the grassland invader Acacia smallii at elevated CO2 concentrations. Tree Physi 17:89–96
Power IL, Dodd MB, Thorrold BS (2001) Deciduous or evergreen does it make a difference to understorey pasture yield and riparian zone management? Proc N Z Grassl Assoc 63:121–125
Rhoades CC (1997) Single-tree influences on soil properties in agroforestry: lessons from natural forests and savanna ecosystems. Agrofor Syst 35:71–94
Sagan C, Toon OB, Pollack JB (1979) Anthropogenic albedo changes and the earth’s climate. Science 206:1363–1368
Sarmiento G (1984) The ecology of neotropical savannas. Harvard University Press, Cambridge, MA
Scanlan JC, Wilson BJ, Anderson ER (1991) Sustaining productive pasture in the tropics. 2. Managing woody vegetation in grazing lands. Trop Grassl 25:85–90
Sierra J, Marban L (2000) Nitrogen mineralization pattern of an oxisol of Guadeloupe, French West Indies. Sol Sci Soc Am J 64:2002–2110
Soder KJ, Stout WL (2003) Effect of soil type and fertilization level on mineral concentration of pasture: potential relationships to ruminant performance and health. J Anim Sci 81:1603–1610
Somarriba E (1988) Pasture growth and floristic composition under the shade of guava (Psidium guajava L.) trees in Costa Rica. Agrofor Syst 6:153–162
Tilman D (1988) Plant strategies and the dynamics and structure of plant communities. Princeton University Press, Princeton, NJ
Tilman D, Wedin D (1991) Plant traits and resource reduction for five grasses growing on a nitrogen gradient. Ecology 72:685–700
Tothill JC, Mott JJ (1985) The ecology and management of the world’s savanna. Australian Academy of Science, Canberra, ACT
Tournebize R, Sinoquet H (1994) Light interaction and partitioning in a shrub/grass mixture. Agril For Meterol 72:277–294
Vetaas OR (1992) Micro-site effects of trees and shrubs in dry savannas. J Veg Sci 3:337–344
Wong CC, Wilson JR (1980) Effects of shading on the growth and nitrogen content of green panic and siratro in pure and mixed swards defoliated at two frequencies. Aust J Agric Res 31:269–285
Acknowledgments
The study was funded by the Central Agricultural Research Institute under Institute Project Scheme of Indian Council of Agricultural Research, New Delhi, India. Authors are thankful to two anonymous reviewers and the associate editor for their valuable suggestions on the manuscript, and to Dr. O. P. Chaturvedi for technical check, Dr. S. N. Pandey for editing English language, and Dr. Manish Sharma for helping with statistical analysis of data.
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Pandey, C.B., Verma, S.K., Dagar, J.C. et al. Forage production and nitrogen nutrition in three grasses under coconut tree shades in the humid-tropics. Agroforest Syst 83, 1–12 (2011). https://doi.org/10.1007/s10457-011-9407-2
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DOI: https://doi.org/10.1007/s10457-011-9407-2