THE IMPACT OF MANAGEMENT PRACTICE ON YIELD AND IRRIGATION WATER USE EFFICIENCY FOR PADDY RICE UNDER SHORTAGE ENVIRONMENT

(1)

THE IMPACT OF MANAGEMENT

PRACTICE ON YIELD AND

IRRIGATION WATER USE

EFFICIENCY FOR PADDY RICE

UNDER SHORTAGE ENVIRONMENT

Yi-Ju Lin , Ching-Tien Chen*, Cheng-Haw Lee ctchen@mail ncyu edu tw* ctchen@mail.ncyu.edu.tw

(2)

Presentation outlines

1. Introduction

2. Materials and Methods

3 Results and Discussions

3. Results and Discussions

(3)

Introduction

Terrain Terrain Limited application Drought

(4)

Introduction

BMP Modify SRI MBMP

Planting Date January 16th _{February 16}th _{January 16}th _{February 16}th

Reaping Date June 4th _{June 14}th _{June 4}th _{June 14}th

Growth Period 140 days 119 days 140 days 119 days Growth Period 140 days 119 days 140 days 119 days

• BMP : the best water management practice.

• Modify SRI : the modify system of rice intensification.

MBMP d ti t ti i i ti i t l f 7 d d i

• MBMP : conducting rotation irrigation interval of 7 days during heading stage.

(5)

Materials

 Material：

• The experiment rice variety would be

Tainan No. 11, which is widely used in Taiwan with high yields.

• The soil texture of the experiment fieldsp is sandy clay loam.

(6)

Materials

 Experimental Environment

• Meteorological Information

(7)

Materials

 Experimental Environment

• Meteorological Information R ainfall Daily Daily R

(8)

Methods

• Analysis of Variance

• Analysis of Impact on Crop Water

Requirement of Paddy Rice

• Analysis of Drought Tolerance and Water

Saving Efficiency of Paddy Rice

(9)

Methods

 Analysis of Variance

• This research took analysis of variance with randomized complete

bl k d i i h f l i th diff i i

block designs in hope of learning the differences in various responses to irrigation, of which by applying two different estimate variances would reach the same result as comparing various average numbers

average numbers.

SST= SSt+ SSb+SSe

SST :Total sum of squares

SSt : Treatment sum of squares SSt : Treatment sum of squares SSb : Block sum of squares

(10)

Methods

 Analysis of Impact on Crop Water Requirement of

Paddy Rice

• This research adopts the most accurate Penman-Monteith Equation (Monteith, 1994) to calculate the reference crop water (ET₀).

900











2



2 0 34 . 0 1 273 900 408 . 0 ET U e e U T S Rn a d         



• The ET₀ of Tainan area could plus crop coefficient with various planting interval could further obtain the crop water requirement







planting interval could further obtain the crop water requirement

(ET_crop)in different growth stages.

ET K

ET K ET₀

(11)

Methods

 Analysis of Drought Tolerance





Y

100%

1 _

















a i i

Y

R

R_i : the yield reduction rate (%) under different management practice Y_i : the yield under different management practice (Kg/ha)

Y_a : the paddy rice yield in controlled area under general management practice (Kg/ha)

(12)

Methods

 Analysis of Water Saving Efficiency

FIR 



%

100 FIR

FIR

1 S

_

















a i i

S_i : the water saving rate (%) of first-season paddy rice under different management practice

FIR_i : the field irrigation water of first-season paddy field under different management practice (m3_/ha)

FIR_a : the field irrigation water of first-season paddy rice in controlled FIR_a : the field irrigation water of first season paddy rice in controlled

(13)

Methods

 Water Resource Productivity Index

Y

WB_i : the water resource productivity under various management

i i i

Y

FIR

WB



WB_i : the water resource productivity under various management practice (Kg/m3₎

Y_i : the productivity under various management practice (Kg/ha) FIR : the field irrigation water under various management practice FIR_i : the field irrigation water under various management practice

(14)

Results and Discussions

 Analysis of the Impact on Management Practice to

Agronomic Traits

Variable Different Management Practice Error Practice Degrees of Freedom 4 10 plant height 43.8** 19.1

total tiller number per cluster 207 9** 17

Mean Square

total tiller number per cluster 207.9 17

effective tiller number per cluster 205.3** 16.1

spikelet number per spike 2580.0** 98.1

grain number per spike 1750.5** 99

Square grain number per spike 1750.5 99

spike weight per cluster 0.0034** 0.00022

fertility 123.7** 9.2

yield 1003479** 53745

yield

(15)

Results and Discussions

 Analysis of Impact on Crop Water Requirement and

Field Irrigation Water for Different Management

P

ti

f P dd Ri

Practice of Paddy Rice

The accumulated crop water requirement is 498498mm.

(16)

Results and Discussions

 Analysis of the Impact on Management Practice to

Yield Reduction Rate and Water Saving Efficiency

39.7%

(17)

Results and Discussions

 Analysis of the Impact on Management Practice to

(18)

Conclusion and Suggestion

• This research applies the irrigation experiment design that

combines

regional rainfall

, physiological characteristic of

crops and rotation irrigation.

regional rainfall

(19)

Conclusion and Suggestion

• In the overall evaluation of

yield reduction rate

and

water

saving rate

, the field irrigation water of first-season paddy rice

planted on February 16

th

_{has reached water saving efficiency}

p a ted o

eb ua y 6

as eac ed

ate sa

g e c e cy

of 14.1%~27.3%, comparing with the ones planted on

January 16

th

_.

• In addition, the

field irrigation water

of

Modify SRI on January

16

th

_{has reached water saving efficiency of 39.7%, comparing}

with

BMP on January 16

th

_{but has influence on yield}

with

BMP on January 16

, but has influence on yield.

• On

water resource productivity

,

Modify SRI with numerous

seedlings

is also the best management practice

(20)

Conclusion and Suggestion

• To view from the growing days and crop water requirement,

the plant date of first crop adjusted from

January 16

th

_to

February 16

_{eb ua y}

₆

th

_{, its growing days would change from}

_{, ts g o}

_{g days}

_{ou d c a ge}

_o

_{140 days}

_{0 days}

to

119 days

; and the accumulated crop water requirement

from

498mm

to

450mm

.

• The field irrigation water decreases due to the

extension of

rotation irrigation interval

. This finding could be applied on

facility preparation of paddy rice hovering stage and irrigation

water use plan establishment.

(21)