Texas, USA 2010 - International Herbage Seed Group
Texas, USA 2010 - International Herbage Seed Group Texas, USA 2010 - International Herbage Seed Group
Effect of row spacing and plant growth regulators on the alfalfa seed yieldP.S. Mao 1 , Y. Sun 1 , X.X. Wei 1 , X.G. Wang 1 , Q.C. Yang 21 Forage Seed Lab, China Agricultural University, Beijing 1001932 Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193 ChinaE-mail: maopeisheng@hotmail.comAbstractThe trials were conducted for comparing the seed yield components and seed yield to utilize rowspacing and plant growth regulators in the fields of alfalfa cv Zhongmu 2. The results showed thatalfalfa seed yield increased with the row spacing from 30cm to 90 cm, but were similar between90cm and 120cm. As the concentration increased, ethephon and paclobutrazol significantly improvedthe inflorescences per square metre, and increased seed yield, especially at the highest treatmentconcentration. For NAA, there were no significantly differences for alfalfa seed yield amongdifferent concentration levels.IntroductionAlfalfa (Medicago sativa L.) is a important forage crop in China, especially in the semiarid croppingregion of north-western China. In this region the climate is suitable for alfalfa seed production withlow humidity and moderate air temperature. Many studies have been conducted on the effects ofthinning and between-row spacing on alfalfa seed yield at multiple locations. Recommendedbetween-row spacings in these studies were quite different and varied from 20 to 91 cm (Askarian etal., 1995; Zhang et al., 2008). Plant growth regulators have opened new prospects for increased seedproduction in grasses and legumes (Lorenzetti, 1993).Materials and MethodsAlfalfa (M. sativa cv Zhongmu 2) was planted in western Inner Mongolia in April 2008. Differenttreatments were designed with row spacing (30cm, 60cm, 90cm, 120cm) and plant growth regulators(ethephon, paclobutrazol and naphthicetic acid) in the fields. Ethephon concentration was 0(CK), 0.5,1.0, 1.5, 2.0 kg/ha; paclobutrazol concentration was 0(CK), 0.2, 0.4, 0.6, 0.8 kg/ha; and naphthiceticacid (NAA) concentration was 0(CK), 0.02, 0.04, 0.06, 0.08 kg/ha. Different plant growth regulatorswere sprayed on the leaves of alfalfa growing in 60cm raw space during the early flowering and peakflowering. Yield components and seed yield were measured during seed development.Results and DiscussionWith the row spacing enlarged, the inflorences per square metre increased, and there weren‟tsignificant difference between 90 and 120 cm row spacing. Ovule number per floret at 90cm spacingwas highest, and seed yield increased with the row spacing from 30 to 120 cm, but was similarbetween 90cm and 120cm. With increased concentration of ethephon and paclobutrazol, the205
inflorescece number and seed yield were improved, but there weren‟t significantly different for floretand ovule number. For NAA, 0.02 and 0.04 kg/ha treatments achieved the higher inflorescencenumber and seed yield, but there weren‟t significantly different with CK. It could be suggested thatthere are different roles on the yield components for ethephon, paclobutrazol and NAA, andunderstanding the key factors will be helpful for alfalfa seed production in the western China.ReferencesAskarian, M., Hampton, J.G. & Hill, M.J. (1995). Effect of row spacing and sowing rate on seedproduction of lucerne cv. Grasslands Oranga. N. Z. J. Agric. Res. 38:289–295.Lorenzetti, F. (1993). Achieving potential herbage seed yields in species of temperate regions. p. 1621–1628. In Baker, M.J. (ed.) Proc. of the 17th Int. Grassl. Congr., Wellington, NZ. 8–21 Feb.Zhang, T.J., Wang, X.G, Han, J.G., Wang, Y.W., Mao, P.S. & Majerus, M. (2008). Efects ofBetween-Row and Within-Row Spacing on Alfalfa Seed Yields. Crop Sci., 48:794–803206
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inflorescece number and seed yield were improved, but there weren‟t significantly different for floretand ovule number. For NAA, 0.02 and 0.04 kg/ha treatments achieved the higher inflorescencenumber and seed yield, but there weren‟t significantly different with CK. It could be suggested thatthere are different roles on the yield components for ethephon, paclobutrazol and NAA, andunderstanding the key factors will be helpful for alfalfa seed production in the western China.ReferencesAskarian, M., Hampton, J.G. & Hill, M.J. (1995). Effect of row spacing and sowing rate on seedproduction of lucerne cv. Grasslands Oranga. N. Z. J. Agric. Res. 38:289–295.Lorenzetti, F. (1993). Achieving potential herbage seed yields in species of temperate regions. p. 1621–1628. In Baker, M.J. (ed.) Proc. of the 17th Int. Grassl. Congr., Wellington, NZ. 8–21 Feb.Zhang, T.J., Wang, X.G, Han, J.G., Wang, Y.W., Mao, P.S. & Majerus, M. (2008). Efects ofBetween-Row and Within-Row Spacing on Alfalfa <strong>Seed</strong> Yields. Crop Sci., 48:794–803206