Exercise 3 a. Study the vocabulary below:
| a good supply | ||||
| primary macronutrients | ||||
| excess N applications | ||||
| soft bulbs | ' | |||
| to be absorbed by the plant | ||||
| split applications of nitrogen | ||||
| a single pre-plant broadcast application | ||||
| should be incorporated into the plow layer | ||||
| banded well away (6") from the seed | 6 | |||
| furrow | ||||
| sidedressed nitrogen applications | ||||
| supplemental | ||||
| excessive rainfall | ||||
| make field curing of onions more difficult | ||||
| markedly | ||||
| rot | ||||
| higher yielding varieties | ||||
| phosphorus | ||||
| vigorous | ||||
| seedlings | () | |||
| potassium | ||||
| the secondary macronutrients | ||||
| calcium | ||||
| magnesium | ||||
| sulfur | ||||
| micronutrients | ||||
| manganese | ||||
| boron | ||||
| zinc | ||||
| copper | ||||
Exercise 3 b. Mach the phrases in column A with their equivalents in column B:
| A. Excessive rainfall and irrigation that cause nitrogen movement beyond the root system can reduce the amount of nitrogen available to the plants. | 1. , , . |
| B. Fertilizer N applied before planting should be incorporated into the plow layer or banded well away (6") from the seed on the furrow side of rows in two-row onion beds. | 2. C . |
| C. A higher percentage of fertilizer N is absorbed by the plant if the fertilizer is applied when the onion root system is well developed. | 3. ̳ , , . |
| D. Excessive nitrogen available to onions, particularly later in the season (mid-July), can delay onion maturity and make field curing of onions more difficult. | 4. , , . |
| E. Onions require a good supply of available nitrogen (N), one of the primary macronutrients. | 5. , , 6 . |
| F Micronutrients include manganese (Mn), boron (B), zinc (Zn) and copper (Cu). | 6. , . |
| G. Higher yielding varieties may require slightly more nitrogen. | 7. , ( ) . |
| H. All Potassium (K) should be applied and worked into the seed bed before planting. | 8. . |
| I. Onion varieties which differ markedly in yield potential (18) can be expected to differ somewhat in their requirements for nitrogen.. | 9. . |
| J. The secondary macronutrients, calcium, magnesium, and sulfur, are generally not limiting to crop production in most Minnesota soils. | 10. , . |
| K. xcess N applications can result in late maturity, large necks that are difficult to cure, soft bulbs and poor storage quality. | 11. , , . |
| L. Inadequate field curing before storage can result in greater losses due to rot. | 12. . |
| M. Sidedressed nitrogen applications or nitrogen applied in irrigation water can be an effective means of providing supplemental nitrogen to the crop during the season. | 13. , , , , ̳ . |
| N. Split applications of nitrogen are used more effectively by the plant than a single pre-plant broadcast application. | 14. , , , . |
|
|
|
