Agricultural Process Engineering by R. N. Reddy

By R. N. Reddy

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Bags made of woven plastic material also are fairly strong but tend to slip when piled high and are harder to close securely after the bag has been opened. Multi-wall bags are made of several layers of paper in a variety of types of construction. They have poor bursting strength when piled high or accidentally dropped, and if used repeatedly, they tend to become brittle along the folds and wear points. Cardboard boxes and cans, though expensive, are re-usable, good for stacking, and provide some protection against mechanical injury to seed and to infestation by seed storage insects.

Information about the vigor of a variety can be partially inferred from the germina tion data if you are familiar with the general relationship between viability and vigor. The relationship between vigor and viability is illustrated by a sigmoid survival curve as shown in Figure 2. lOOI~~~~·~-~-~_=====;===----------------------' "'-- ... , ,, , \ \ \ I I I Vigor/' , I I \ \ , o L-__________________ Time ~~~~== _____I .... Figure 2. Relationship between the decline in vigor and viability over time.

Seeds of legumes and brassicas often develop a split along one side of the pod. This is the best time to collect the seed, before the pods start to open and scatter their seed. Most flower seed heads are not ready to harvest until the flower head has dried completely to the base, including a short section of the supporting stem. Some plant families, such as the Asteraceae have a smaller percentage of viable seed in the head, and the seeds continue to mature after collection. For this reason it is best not to be too hasty in harvesting the seed.

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