Answered: Explain why knowledge of the effects in…

Science

Biology

Explain why knowledge of the effects in density is important to the crop farmer.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter32: Plant Reproduction

Section: Chapter Questions

Problem 15RQ: Plant species that complete their lifecycle in one season are known as. biennials perennials annuals...

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Concept explainers

Ecological Interactions

The study of the ecological interactions between living beings and their physical environment, including humans, is ecology. It aims to understand the crucial links between plants and animals and the world around them. Ecology also gives knowledge on the advantages of ecosystems and how we may use Earth resources to ensure that future generations have a healthy environment.

Question

Intraspecific competition is a competition between members of the same species and is commonly observed in crop plants. Table 6.2 shows the results of a greenhouse experiment which examined the effects of density on the germination and growth of barley. Plants were grown for two weeks in 10- cm diameter pots kept in identical environmental conditions and watered regularly. At the end of the experiment the plants were cropped by cutting the stems at the soil surface.

Explain why knowledge of the effects in density is important to the crop farmer.

Table 6.2 Effect of seed density on germination rate, biomass and stem length in barley
Number of plants
that germinated
Mean stem length
(cm)
Number of seeds
Germination rate
Total wet biomass
Mean wet biomass
sown per pot
(%)
of plants (g)
of plants (g)
50
43
86
17.0
0.395
25.6
100
88
21.4
19.2
200
168
27.7
14.3
400
332
40.9
13.6

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