This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Discuss at least five reasons why weeds are the most important pest to crops. What will be an ... (Read 76 times)

melina_rosy

  • Hero Member
  • *****
  • Posts: 531
on: Jul 21, 2018
Discuss at least five reasons why weeds are the most important pest to crops.
 
  What will be an ideal response?

Question 2

Biodiesel, biomass, methane, and ___________________ _ are the most common forms of biofuel.
 
  Fill in the blank(s) with correct word


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

mohan

  • Sr. Member
  • ****
  • Posts: 362
Reply #1 on: Jul 21, 2018
Answer to Question 1

Weeds reduce the yield of cultivated crops by competing for essential resources. Weeds increase production costs during their control. Some weeds are allelopathic. Some weeds are parasitic and obtain their nutrients directly from other plants. Weeds devalue the primary crop. Weeds may contain toxins in their herbage that is harmful to livestock. Weeds compete with crops for light, water, and minerals. In annual cropping systems, effective competitors for light often have high levels of seedling vigor that allow for development of a weed canopy above the crop. The effect of weeds on crop growth and yield is typically greatest during crop establishment. Tall-growing weeds overgrow the crop and reduce the intensity and quality of the light received by the crop.

Answer to Question 2

ethanol


melina_rosy

  • Member
  • Posts: 531
Reply 2 on: Jul 21, 2018
Thanks for the timely response, appreciate it

peter

  • Member
  • Posts: 330
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

Did you know?

Carbamazepine can interfere with the results of home pregnancy tests. If you are taking carbamazepine, do not try to test for pregnancy at home.

Did you know?

A serious new warning has been established for pregnant women against taking ACE inhibitors during pregnancy. In the study, the risk of major birth defects in children whose mothers took ACE inhibitors during the first trimester was nearly three times higher than in children whose mothers didn't take ACE inhibitors. Physicians can prescribe alternative medications for pregnant women who have symptoms of high blood pressure.

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Did you know?

GI conditions that will keep you out of the U.S. armed services include ulcers, varices, fistulas, esophagitis, gastritis, congenital abnormalities, inflammatory bowel disease, enteritis, colitis, proctitis, duodenal diverticula, malabsorption syndromes, hepatitis, cirrhosis, cysts, abscesses, pancreatitis, polyps, certain hemorrhoids, splenomegaly, hernias, recent abdominal surgery, GI bypass or stomach stapling, and artificial GI openings.

wild discuss fish wild discuss fish
One of the reasons I went to Cambodia was to interview a feral child—the boy shown here—who ... One of the reasons I went to Cambodia was to interview a feral child—the boy shown here—who ...
Using alert labels enables the medical staff to quickly identify important information such as ... Using alert labels enables the medical staff to quickly identify important information such as ...
Important Trace Elements in the Body Important Trace Elements in the Body
Important Concepts in Clinical Massage Therapy Important Concepts in Clinical Massage Therapy
Red, fleshy fruits of hawthorn plants (Crataegus) are an important food for cedar waxwings (Bombycil Red, fleshy fruits of hawthorn plants (Crataegus) are an important food for cedar waxwings (Bombycil
Video: Brief Summary on Photosynthesis - Animation

For a complete list of videos, visit our video library