Effect of green manure crops, termination method, stubble crops, and fallow on soil water, available N, and exchangeable P

Green manure crops may have a role to play in the development of sustainable agricultural systems in the semiarid northern Great Plains of North America. This study determined the benefits of different green manure crops, seeding dates, and termination methods on soil nitrogen, phosphorus, and moist...

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Bibliographic Details
Published in:Canadian journal of plant science 2016-10, Vol.96 (5), p.867-886
Main Authors: Mooleki, S.P, Gan, Y, Lemke, R.L, Zentner, R.P, Hamel, C
Format: Article
Language:English
Subjects:
Agricultural economics
arrêt de la croissance des engrais verts
Autumn
available soil nitrogen
azote disponible dans le sol
conservation de l’eau du sol
Crops
engrais vert
exchangeable phosphorus
Frost
Glyphosate
green manure
green manure termination
Lathyrus sativus
Lens culinaris
Manures
milieu semi-aride
OTHER
phosphore échangeable
Phosphorus
Pisum sativum
Plant sciences
Seeding
semi-arid environments
Silage
Soil moisture
soil water conservation
Stubble
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Summary:Green manure crops may have a role to play in the development of sustainable agricultural systems in the semiarid northern Great Plains of North America. This study determined the benefits of different green manure crops, seeding dates, and termination methods on soil nitrogen, phosphorus, and moisture, as well as the performance of durum wheat following green manures the following year. Field experiments were conducted at Swift Current, Saskatchewan, from 2006 to 2009. Three green manure crops [forage pea (Pisum sativum L.), chickling vetch (Lathyrus sativus L.), and black lentil (Lens culinaris Medik.)] were seeded in May, June, and July, and terminated at full bloom using glyphosate, rototilling or by frost. Other treatments included summerfallow and stubble of selected crops harvested for grain or silage. Different green manure crops, seeding dates or termination methods had similar effects on soil moisture, available N, and exchangeable P at termination or the following spring. These effects of green manure management on soil residual characteristics were comparable to those observed under summerfallow, but higher than those on grain or silage stubble. Therefore, green manure is a viable alternative to summerfallowing and could be seeded any time during the growing season. If seeded late, green manure could be terminated by frost, thus saving on costs.
ISSN:0008-4220
1918-1833
DOI:10.1139/cjps-2015-0336