Lecture 5: Population Density Flashcards
1
Q
POPULATION DENSITY
A
- number of plants per unit area
2
Q
BENEFITS OF OPTIMUM POPULATION DENSITY
A
- early build up of sufficient leaf index
- better control of weeds
- increase efficiency in use of land, light, and water
3
Q
FACTORS AFFECTING POPULATION DENSITY
A
- crop species and varieties
- soil fertility and management practices
- season
- method of propagation
- mechanization employed
- cropping system
4
Q
PARAMETERS FOR CROP SPECIES AND VARIETIES
A
- plant height
- canopy shape and size
- growth habit
- horizontal spread of root system
5
Q
CONDITIONS IN ADAPTING LOWER POPULATION DENSITY
A
- fertile soils
- rainy season
6
Q
CONDITIONS IN ADAPTING HIGHER POPULATION DENSITY
A
- use of dwarfing rootstock in grafting
7
Q
PD COMPUTATION FOR ANNUAL CROPS
A
- hill method
- drill method
8
Q
PD COMPUTATION: HILL METHOD
A
PD = [(Area)(No. of plants/hill)] / [(Distance between hills)(Distance between furrows)]
9
Q
PD COMPUTATION: DRILL METHOD
A
PD = [(Area)(No. of plants/linear meter)] / (Distance between rows)
10
Q
PD COMPUTATION FOR PERENNIAL CROPS
A
- square
- triangular (hexagonal)
- quincunx (diagonal)
- contour
11
Q
SQUARE SYSTEM
A
- plants placed at corners of the square
- equidistant with one another
12
Q
PD COMPUTATION: SQUARE
A
PD = (Area) / (s^2)
13
Q
TRIANGULAR SYSTEM
A
- plants placed at corners of the triangle
- 15% higher PD than square system
14
Q
PD COMPUTATION: TRIANGULAR
A
PD = (Area) / [(s^2)(0.866)
PD = [(Area) / (s^2)][1.15]
15
Q
QUINCUNX SYSTEM
A
- modification of square system
- additional plant at the center of each square
- higher PD than square and triangular systems
