Weed science focuses on mitigating the negative impacts of weeds on crops Landis et al. 2005. Weed Science
A plant that is successful in colonizing disturb, but potentially productive sites and at maintaining their abundance under conditions of repeated disturbances MohlerC., 2001. Ecological Management of Agricultural Weeds Search the causes of why we have weeds
Disturbance A discrete event that disrupts ecosystem, community or population structure Changes resources, substrate availability or the physical environment
Weed control.pdf Manure=excrement from animals, especially horses, which is spread on the land in order to make plants grow well
A good crop rotation plan is a seasonal dance in which the crops move from spot to spot creating a garden that is constantly new. constantly adverb all the time or frequently Intriguing = to interest someone a lot, especially by being strange, unusual or mysterious intrigue (SECRET) noun [C or U] (the making of) a secret plan to do something, especially something that will harm another person
Weed control.pdf http://deeprootsco.org/CropRotation.htm What are the benefits of rotating? Maintains soil fertility, reducing the use of fertilizers by preventing soil depletion One crop will pull a particular set of nutrients from the soil Other crops will give back Reduce or prevent common plant diseases Reduce soil erosion Helps control weeds reducing the need for herbicides Maintains soil structure (alternating between deep-rooted and fibrous-rooted crops)
Overview of cover crops and green manures
4 cover crops and weed management Cash crop=a crop that is grown mainly to be sold, rather than used by the people who grew it or those living in the area it is grown in
Cover crop From Wikipedia, the free encyclopedia Cover crops can also improve soil quality by increasing soil organic matter levels through the input of cover crop biomass over time. Increased soil organic matter enhances soil structure , as well as the water and nutrient holding and buffering capacity of soil.
Transcript of "Crop rotation 8 march2012-edit2"
Crop rotation, cover crops andecological weed management Assist.Prof.Dr. Boonthida Kositsup Department of Botany Faculty of Science 1
Definition of a weed• A weed is an undesired plant out of place – Water hyacinth in a aquatic garden : not a weed – Water hyacinth clogging canals : a weed 3
What is a Weed?• A plant that is growing where it is not wanted Roberts et al. 1982. Weed Control Handbook 4
What is a Weed?• A plant that is successful in colonizing disturb, and maintaining their abundance under conditions of repeated disturbances MohlerC., 2001. Ecological Management of Agricultural Weeds 5
Disturbance• An event that disrupts ecosystem, community or population structure• Changes resources, substrate availability or the physical environment Pickett and White, 1985 6
Why Do We Have Weeds?BECAUSE WE CREATE THE ENVIROMENTSWHERE WEEDS THRIVE (go, develop or besuccessful)! 8
What management practices contribute toweed problems?• Poor soil management• Excessive use of manure• Poor crop rotations using crops with similar seasonal growth patterns which have similar weed species associated with them. 9
Weed Management• Goal Manage cropping systems (not just weeds!) so that the resources made available through disturbances are captured by crop and not by weeds 10
What are some conventional treatments used to control weeds?• Physical removal – The use of agricultural tools such as hoe to physically remove weeds• Chemical suppression – Herbicide application is not favored in ecological farming 11
What are some basic principles for ecological weed control?• Create a diverse ecosystem. Use as many species and types of plants as possible• Use a good crop rotation• Don’t over fertilize your soil with manure or fertilizers as this will leave too much fertility on the soil for weeds• Use clean seed (free of weeds) 12
Crop Rotation“Rotation of crops, when accompaniedby care in the use of pure seed, is themost effective means yet devised forkeeping land free of weeds.” Leighty (1938) 13
Crop rotation• is the practice of growing a series of dissimilar types of crops in the same area in sequential seasons. 14
Crop rotation: two considerations3.Vary the seasonality of planting Varying crop seasonality and management practices prevent any one species from getting out of control5.Vary crops allow you to vary management practices 15
How does crop rotation help control weeds?• Breaks weed multiplication cycles, as certain weeds are associated with certain crops.• Maintain soils fertility which helps crop growth.• Crops that have different season growth patterns compete for weed space on the field, as weeds have different growth cycles. 16
Cover cropsare crops whose main purpose is to benefit thesoil, to manage soil fertility, but is not intended tobe harvested for feed or sale. 17
What is a cover crop? A crop whose main purpose is to benefit the soil or other crops in one or more ways, but is not intended to be harvested for feed or sale. 18
Cover crops• Plants that are grown for various ecological benefits other than as a cash crop (a crop that is grown mainly to be sold).• They may be grown in rotations during periods when cash crops (main crops) are not grown. 19
Advantages of cover crops• Cover crops can also improve soil quality by increasing soil organic matter. Increased soil organic matter enhances soil structure, as well as the water and nutrient holding of soil.• Weed suppression 20
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