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Organic broccoli production on transition soils: Comparing cover crops, tillage and sidedress N

Published online by Cambridge University Press:  26 February 2009

Daniel L. Schellenberg ,
Ronald D. Morse  and
Gregory E. Welbaum
Daniel L. Schellenberg
Affiliation:
Department of Viticulture and Enology, University of California, One Shields Avenue, Davis, CA 95616, USA.
Ronald D. Morse
Affiliation:
Department of Horticulture, Virginia Polytechnic Institute and State University, 301 Saunders Hall, Blacksburg, VA 24061-0327, USA.
Gregory E. Welbaum*
Affiliation:
Department of Horticulture, Virginia Polytechnic Institute and State University, 301 Saunders Hall, Blacksburg, VA 24061-0327, USA.
*
*Corresponding author: welbaum@vt.edu
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Abstract

Little information is available about how farmers in transition to organic practices should manage short- and long-term N fertility. The objectives of this research were (1) to evaluate the leguminous cover crops lablab (Dolichos lablab L.), soybean (Glycine max L.), sunn hemp (Crotalaria juncea L.) and a mixture of sunn hemp and cowpea (Vigna sinensis Endl.) as N sources; (2) to compare N availability and broccoli yield when cover crops were incorporated with conventional tillage (CT) or retained as a surface mulch using no-tillage (NT) practices; and (3) to quantify the amount of supplemental sidedress nitrogen required to maximize the yield of organic broccoli (Brassica oleracea Group Italica) on transition soils. Broccoli was grown during the first year after organic transition in the spring and fall of 2006 at the Kentland Agricultural Research Farm near Blacksburg, VA. Spring (P<0.001) and fall (P<0.001) broccoli yield increased as the rate of sidedress N was increased up to 112 kg N ha−1, and showed a quadratic correlation with leaf N (P=<0.001, R2=0.80 and P=<0.001, R2=0.38, respectively). There was no difference in spring broccoli yield between CT and NT; however, CT produced the highest yield in the fall crop. At low sidedress N rates, leaf N was highest in CT plots, but tillage had no effect on N uptake at high N rates. This indicates that early season and perhaps total plant-available mineralized N was greater in CT than NT; however, potential N deficiency in NT soil may be compensated by sidedress N. Broccoli yield was not affected by leguminous cover crop, even though the quantity of cover crop biomass and N contribution was different among species. This suggests that N availability from leguminous cover crops may be impacted by other ecological processes such as soil microbial activity. This study shows that organic CT and NT growers can maximize broccoli yield in transition soils low in N availability, by using leguminous cover crops in combination with moderate amounts of sidedress N.

Keywords

Brassica olercea Group Italicasustainable agriculture
Type
Preliminary Report
Information
Renewable Agriculture and Food Systems , Volume 24 , Issue 2 , June 2009 , pp. 85 - 91
Copyright
Copyright © Cambridge University Press 2009

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References

1Berry, P.M., Sylvester-Bradley, R., Philipps, L., Hatch, D.J., Cuttle, S.P., Rayns, F.W., and Gosling, P. 2002. Is the productivity of organic farms restricted by the supply of available nitrogen? Soil Use and Management 18:248–255.CrossRefGoogle Scholar
2Clark, M.S., Horwath, W.R., Shennan, C., Scow, K.M., Lantini, W.T., and Ferris, H. 1999. Nitrogen, weeds and water as yield-limiting factors in conventional, low-input, and organic tomato systems. Agriculture Ecosystems and Environment 73:257–270.CrossRefGoogle Scholar
3Pang, X.P. and Letey, J. 2000. Organic farming: challenge of timing nitrogen availability to crop nitrogen requirements. Soil Science Society of America Journal 64:247–253.CrossRefGoogle Scholar
4Scow, K.M., Somasco, O., Gunapala, N., Lau, S., Venette, R., Ferris, H., Miller, R., and Shennan, C. 1994. Transition from conventional to low-input agriculture changes soil fertility and biology. California Agriculture 48:20–26.CrossRefGoogle Scholar
5Drinkwater, L.E. 2004. Improving fertilizer nitrogen use efficiency through an ecosystem-based approach. In Mosier, A.R., Syers, J.K., and Freney, J.R. (eds). Agriculture and the Nitrogen cycle: Assessing the Impacts of Fertilizer use on Food production and the Environment. Island Press, Washington, DC. p. 93–102.Google Scholar
6Tu, C., Louws, F.J., Creamer, N.G., Mueller, J.P., Brownie, C., Fager, K., Bell, M., and Hu, S. 2006. Responses of soil microbial biomass and N availability to transition strategies from conventional to organic farming systems. Agriculture, Ecosystems and Environment 113:206–215.CrossRefGoogle Scholar
7Jackson, L.E. 2000. Fates and losses of nitrogen from a nitrogen-15-labeled cover crop in an intensively managed vegetable system. Soil Science Society of America Journal 64:1404–1412.CrossRefGoogle Scholar
8Pasakdee, S., Banuelos, G., Shennan, C., and Cheng, W. 2006. Organic N fertilizers and irrigation influence organic broccoli production in two regions of California. Journal of Vegetable Science 12:27–46.CrossRefGoogle Scholar
9Calderon, F.J., Jackson, L.E., Scow, K.M., and Rolston, D.E. 2001. Short-term dynamics of nitrogen, microbial activity, and phospholipid fatty acids after tillage. Soil Science Society of America Journal 65:118–126.CrossRefGoogle Scholar
10Drinkwater, L.E., Janke, R.R., and Rossoni-Longnecker, L. 2000. Effects of tillage intensity on nitrogen dynamics and productivity in legume-based grain systems. Plant and Soil 227:99–113.CrossRefGoogle Scholar
11Calderon, F.J., Jackson, L.E., Scow, K.M., and Rolston, D.E. 2000. Microbial responses to simulated tillage in cultivated and uncultivated soils. Soil Biology and Biochemistry 32:1547–1559.CrossRefGoogle Scholar
12Drinkwater, L.E., Wagoner, P., and Sarrantonio, M. 1998. Legume-based cropping systems have reduced carbon and nitrogen losses. Nature 19(396):262–265.CrossRefGoogle Scholar
13Quemada, M. and Cabrera, M.L. 1995. Carbon and nitrogen mineralized from leaves and stems of four cover crops. Soil Science Society of America Journal 59:471–477.CrossRefGoogle Scholar
14Hoyt, G., Monks, D., and Monaco, T. 1994. Conservation tillage for vegetable production. HortTechnology 4:129–135.CrossRefGoogle Scholar
15Peterson, L.A. and Chesters, G. 1964. A reliable total nitrogen determination on plant tissue accumulating nitrate nitrogen. Agronomy Journal 56:90.CrossRefGoogle Scholar
16Morse, R.D., Vaughan, D.H., and Belcher, L.W. 1993. Evolution of conservation tillage systems for transplanted crops—potential role of the subsurface tiller transplanter. Southern Conservation Tillage Conference for Sustainable Agriculture. Monroe, LA.Google Scholar
17Cutcliffe, J. 1971. Effects of plant population, nitrogen and harvest date on yield and maturity of single-harvested broccoli. HortScience 6:482–484.CrossRefGoogle Scholar
18Kahn, B., Shilling, P., Brusewitz, G., and McNew, R. 1991. Force to shear the stalk, stalk diameter, and yield of broccoli in response to nitrogen fertilization and within-row spacing. Journal of the American Society for Horticultural Science 116:222–227.CrossRefGoogle Scholar
19Dufault, R.J. and Waters, L. 1985. Interaction of nitrogen fertility and plant populations on transplanted broccoli and cauliflower yields. HortScience 20:127–128.CrossRefGoogle Scholar
20Hipp, B. 1974. Influence of nitrogen and maturity rate on hollow stem in broccoli. HortScience 9:68–69.CrossRefGoogle Scholar
21Wolf, B. 1996. Diagnostic Techniques for Improving Crop Production. Food Products Press, New York.Google Scholar
22Zebarth, B., Bowen, P., and Toivonen, P. 1995. Influence of nitrogen-fertilization on broccoli yield, nitrogen accumulation and apparent fertilizer-nitrogen recovery. Canadian Journal of Plant Science 75:717–725.CrossRefGoogle Scholar
23Everaarts, A.P. and De Willigen, P. 1999. The effect of nitrogen and the method of application on yield and quality of broccoli. Netherlands Journal of Agricultural Science 47:123–133.CrossRefGoogle Scholar
24Kowalenko, C.G. and Hall, J.W. 1987. Effects of nitrogen applications on direct-seeded broccoli from a single harvest adjusted for maturity. Journal of the American Society of Horticultural Science 112:9–13.CrossRefGoogle Scholar
25Abdul-Baki, A.A., Morse, R.D., Devine, T.E., and Teasdale, J.R. 1997. Broccoli production in forage soybean and foxtail millet cover crop mulches. HortScience 32:836–839.CrossRefGoogle Scholar
26Infante, M.L. and Morse, R.D. 1996. Integration of no-tillage and overseeded legume living mulches for transplanted broccoli production. HortScience 31:376–380.CrossRefGoogle Scholar
27Morse, R.D. 1995. No-till, no-herbicide systems for production of transplanted broccoli. In Kingery, W.L. and Buehring, N. (eds). A focus on Water Quality: Southern Region Conservation Tillage for Sustainable Agriculture. Jackson, MS. p. 113–116.Google Scholar
28Fox, R.H. and Bandel, V.A. 1984. Nitrogen utilization with no-tillage. In Phillips, R.E. and Phillips, S.H. (eds). No-Tillage Agriculture: Principles and Practices. Van Nostrand Reinhold Company Inc., New York. p. 117–148.Google Scholar
29Puget, P. and Drinkwater, L.E. 2001. Short-term dynamics of root- and shoot-derived carbon from a leguminous green manure. Soil Science Society of America Journal 65:771–779.CrossRefGoogle Scholar
30Wagger, M.G. 1989. Time of desiccation effects on plant composition and subsequent nitrogen release from several winter annual cover crops. Agronomy Journal 81:236–241.CrossRefGoogle Scholar
31Wang, W.J., Dalal, R.C., Moody, P.W., and Smith, C.J. 2003. Relationships of soil respiration to microbial biomass, substrate availability and clay content. Soil Biology and Biochemistry 35:273–284.CrossRefGoogle Scholar