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Robert L. Meagher Jr., Rodney N. Nagoshi, James T. Brown, Shelby J. Fleischer, John K. Westbrook and Carlene A. Chase

Sunn hemp, Crotalaria juncea L., is a warm-season legume that is planted before or after a vegetable cash crop to add nutrients and organic matter to the soil ( Cherr et al., 2006 , 2007 ; Mansoer et al., 1997 ; Wang et al., 2005 ). This cover

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Alyssa H. Cho, Carlene A. Chase, Danielle D. Treadwell, Rosalie L. Koenig, John Bradley Morris and Jose Pablo Morales-Payan

analysis of the cover crop sunn hemp ( Crotalaria juncea L.) and its potential for seed production and weed control in Puerto Rican agricultural systems. MS thesis, Univ. of Puerto Rico, Mayagüez, PR Mansoer, Z. Reeves, D.W. Wood, C.W. 1997 Suitability of

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Emillie M. Skinner, Juan Carlos Díaz-Pérez, Sharad C. Phatak, Harry H. Schomberg and William Vencill

inhibitory effect on lettuce and annual ryegrass germination compared with ’Rye-2’ residue. Germination of carrot and sicklepod was unaffected by the four cover crop treatments. Table 1. Influence of sunnhemp ( Crotalaria juncea L.) and rye ( Secale cereale

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Muhammad Mansoor Javaid, Manish Bhan, Jodie V. Johnson, Bala Rathinasabapathi and Carlene A. Chase

, M. Weidenhamer, J.D. Weston, L.A. 2009 Assessment of the phytotoxic potential of m-tyrosine in laboratory soil bioassays J. Chem. Ecol. 35 1288 1294 Cole, S.D. 1991 Allelopathic effects of Crotalaria juncea , MA thesis, Univ. South Dakota

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Jialin Yu, Nathan S. Boyd and Zhengfei Guan

Weed Sci. 50 448 460 Cho, A.H. Chase, C.A. Treadwell, D.D. Koenig, R.L. Morris, J.B. Morales-Payan, J.P. 2015 Apical dominance and planting density effects on weed suppression by sunn hemp ( Crotalaria juncea L.) HortScience 50 263 267 Dotzenko, A

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Michael J. Adler and Carlene A. Chase

production: A synthesis Agron. J. 98 302 319 Cole, S.D. 1991 Allelopathic effects of Crotalaria juncea Univ. of South Dakota MS Thesis Collins, A.S. 2004 Leguminous cover crop fallows for the

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Anthony M. Ortiz, Brent S. Sipes, Susan C. Miyasaka and Alton S. Arakaki

cv. Dwarf Essex, Crotalaria juncea , and Sorghum nothosubsp. drummondii cvs. Piper and Sordan 79. Effects of Meloidogyne javanica and Pythium aphanidermatum in the greenhouse trial: All crops Probabilities of whole plot main effects, subplot

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Jose Linares, Johannes Scholberg, Kenneth Boote, Carlene A. Chase, James J. Ferguson and Robert McSorley

Cruz, CA Wang, K.H. McSorley, R. Marshall, A. Gallaher, R.N. 2006 Influence of organic Crotalaria juncea hay and ammonium nitrate fertilizers on soil nematode communities Appl. Soil Ecol. 31 186

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Alyssa H. Cho, Alan W. Hodges and Carlene A. Chase

Partial budget analyses of five summer fallow treatments in Florida preceding a cash crop of summer squash (Cucurbita pepo) were conducted. The five treatments were sunn hemp (Crotalaria juncea), velvet bean (Mucuna deeringiana), cowpea (Vigna unguiculata), sorghum-sudangrass (Sorghum bicolor × S. bicolor var. sudanense), and tillage. Costs were estimated for each summer fallow treatment, including the cost of seed, inoculant, implementation, management, and termination. Benefits were calculated in terms of contributions to the following cash crop of summer squash in the form of biologically fixed nitrogen and reduced weed pressure. Results showed that total production costs were minimized by cover crops, even though implementation costs were higher than for tillage.

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Mari Marutani

Sunn-hemp, Crotalaria juncea L. cv. Tropic Sun was developed in Hawaii in 1982 and recently introduced to the island of Guam by USDA Soil Conservation Service as a potential green manure crop. An evaluation of various legumes at three different soil regimes revealed that sunn-hemp produced greater biomass than other plants. In the study of the effects of sunn-hemp in subsequent vegetable production, slightly greater canopy was observed for potato, Solanum tuberosum cv. Kennebec, with green manuring with sunn-hemp than without. Yield of head cabbage, Brassica oleracea var. capita cv. KK Cross, was higher with green manuring (1085.5g/head) than without (725.4g/plant). Competition between indigenous rhizobia and introduced inoculant seems to exist at some locations. Major constraints in using sunn-hemp as green manure on the island are its limited seed sources and requirements of additional labor. Education and promotion of using this legume in a long term soil-improving system is needed.