AGN 115 Exam 4 | 100% Correct Answers |
Verified | Latest 2024 Version
Roller crimper breaks stems to reduce pop-up; morning turger is normally highest - ✔✔True
Few plants, especially ag crops, grow well outside the pH range of 5-8 pH - ✔✔True
Over yielding occurs when total combined yield of intercropped species (traditional corn-bean-squash
polyculture of native americans) is greater then the combined yield of the same crops grown in
monoculture on an equivalent total land area - ✔✔true
Because of the need for monoculture in ag systems to facilitate ease of management, there are very few
ways to increase ecological diversity without considerable expense or difficulty - ✔✔false
in terms of agro-ecosystem diversity, an example of undesirable "simplification" of the system would be
the of predatory insects through indiscriminate use of a broad- spectrum insecticide - ✔✔true
Living mulches can keep soil cooler, reduce weeds and erosion, and reduce competition for soil during
dry periods - ✔✔false
cover crops are often planted in mixtures of at least one grass and one legume - ✔✔true
Beneficial use of cover crops is restricted to providing cover during late fall, winter and early spring
season - ✔✔false
Island biogeography theory can be applies to pest and beneficial insects in ag fields to better understand
how they're distributed into a crop such as soybeans or a vineyard - ✔✔false
Plowing cover crops under early in the spring will increase the decomposition rate of cover plant
material - ✔✔false
, allowing cover crops to mature will improve nutrient accumulation in the cover biomass, but it may
reduce the ability of microbes to decompose residues for short term use - ✔✔true
some types of cover crops can contribute to weed management, while some types of weed infestations
should be controlled before using cover crops in a no-till scenario - ✔✔true
in contrast to row crops such as soybean, leguminous cover crops are not sensitive to soil pH for good
nodulation and N fixation - ✔✔false
a catch crop is used primarily to reduce soil erosion by "catching" soil particles before they travel far and
are almost always sod- forming grasses - ✔✔false
crimson clover could be used a winter cover crop or green manure. Although it is an annual species, it
could provide years of benefit to producers if it's allowed to become physiologically mature and re-seed
itself - ✔✔true
small differences in ENM cost can be economically important if you have a large area in need of
amendment and the soil test limiting suggestion calls for 1500 ENM - ✔✔true
dealers of ag limiting materials are not required to provide the ENM value to each customer - ✔✔false
although Hoyt's 2005 article estimated the cost of a pound of N in mineral fertilization to $0.41, prices of
N fertilizer have increased to about ______ per pound of N - ✔✔$0.60
a strip tillage system results in - ✔✔only about 50% of the field area being tilled and faster soil warm up
in the spring
compared to no-till, conventionally tilled soil have runoff that is - ✔✔similar to quantity and quality
_____ results in lower runoff and erosion - ✔✔increasing vegetative cover
Verified | Latest 2024 Version
Roller crimper breaks stems to reduce pop-up; morning turger is normally highest - ✔✔True
Few plants, especially ag crops, grow well outside the pH range of 5-8 pH - ✔✔True
Over yielding occurs when total combined yield of intercropped species (traditional corn-bean-squash
polyculture of native americans) is greater then the combined yield of the same crops grown in
monoculture on an equivalent total land area - ✔✔true
Because of the need for monoculture in ag systems to facilitate ease of management, there are very few
ways to increase ecological diversity without considerable expense or difficulty - ✔✔false
in terms of agro-ecosystem diversity, an example of undesirable "simplification" of the system would be
the of predatory insects through indiscriminate use of a broad- spectrum insecticide - ✔✔true
Living mulches can keep soil cooler, reduce weeds and erosion, and reduce competition for soil during
dry periods - ✔✔false
cover crops are often planted in mixtures of at least one grass and one legume - ✔✔true
Beneficial use of cover crops is restricted to providing cover during late fall, winter and early spring
season - ✔✔false
Island biogeography theory can be applies to pest and beneficial insects in ag fields to better understand
how they're distributed into a crop such as soybeans or a vineyard - ✔✔false
Plowing cover crops under early in the spring will increase the decomposition rate of cover plant
material - ✔✔false
, allowing cover crops to mature will improve nutrient accumulation in the cover biomass, but it may
reduce the ability of microbes to decompose residues for short term use - ✔✔true
some types of cover crops can contribute to weed management, while some types of weed infestations
should be controlled before using cover crops in a no-till scenario - ✔✔true
in contrast to row crops such as soybean, leguminous cover crops are not sensitive to soil pH for good
nodulation and N fixation - ✔✔false
a catch crop is used primarily to reduce soil erosion by "catching" soil particles before they travel far and
are almost always sod- forming grasses - ✔✔false
crimson clover could be used a winter cover crop or green manure. Although it is an annual species, it
could provide years of benefit to producers if it's allowed to become physiologically mature and re-seed
itself - ✔✔true
small differences in ENM cost can be economically important if you have a large area in need of
amendment and the soil test limiting suggestion calls for 1500 ENM - ✔✔true
dealers of ag limiting materials are not required to provide the ENM value to each customer - ✔✔false
although Hoyt's 2005 article estimated the cost of a pound of N in mineral fertilization to $0.41, prices of
N fertilizer have increased to about ______ per pound of N - ✔✔$0.60
a strip tillage system results in - ✔✔only about 50% of the field area being tilled and faster soil warm up
in the spring
compared to no-till, conventionally tilled soil have runoff that is - ✔✔similar to quantity and quality
_____ results in lower runoff and erosion - ✔✔increasing vegetative cover
