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Influence of Drip Irrigation and Nitrogen Rates on Strawberry

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									Influence of Drip Irrigation and Nitrogen Rates on Strawberry Cultivars
Bielinski M. Santos, Gulf Coast REC John R. Duval, Gulf Coast REC Eric H. Simonne, Horticultural Sciences Dept. Elizabeth A. Golden, Gulf Coast REC Alicia J. Whidden, Hillsborough Co. Extension Serv.

Florida Vegetables
Acres US$M

42,400

501

18,500

218

7,100

178
Source: USDA, 2005

Introduction
Efficient water use in agriculture is becoming increasingly important.  Competition between urban population and growing fields.


Introduction


Proper irrigation schedules and volumes are needed for optimal crop growth. Plastic mulch and drip irrigation have helped to decrease water use.



Introduction


Irrigation management remains a misunderstood aspect of production. Over-irrigation may increase:
Nutrient leaching & soil erosion.  Fuel/electricity costs.  Disease/weed pressure.  Crop losses.




Introduction


Nitrogen (N) is applied through drip irrigation in strawberry fields. Current recommendations:
Drip irrigation: 100 gal/100 ft/week.  N application: 0.6 lb/acre/day.




Introduction


Growers use diverse irrigation/fertilization programs.
Irrigation frequencies (up to 5 times/day).  N rates (1-2 lb/acre/day).




Strawberry cultivars may have different requirements.
More accurate recommendations are needed.



Objective
 Determine

the effect of irrigation and N rates on different strawberry cultivars.

Materials and Methods



Three trials (fall 2003-05).
Gulf Coast REC (Dover & Balm).

Materials and Methods


Irrigation rates:


60, 80, 100 & 120% IFAS recommendation.



N rates:
2003-04: 60, 80 & 100% IFAS recomm.  2005: 60, 100 & 140% IFAS recomm.




Strawberry cultivars:


‘Winter Dawn’, ‘Strawberry Festival’ & ‘Ventana’.

Materials and Methods

  

Marketable yield.
Split-split plot design. Four replications. Regression analysis & orthogonal contrasts.

WD

SF

V

20

2003 Season c a b

e o k a ei dt a e Ma r e t b l y l ( n / c r )

10

c b a a a b b b a a c b

0
De c
 

a Jn

Feb

Ma r

Tot l a

Interactions: NS N & I main effects: NS

Mo n t s h

De c

a Jn

Feb

Ma r

5

‘Strawberry Festival’ 2004 Season

4
e o a e k a ei dt Ma r e t b l y l ( n / c r )

3

2

1

0
60 80 1 00

Nit g e n r t ( I AS r c o me n d a t n ) o r a e %F e m io

De c

a Jn

Feb

5 4
e o ak a ei dt a e M r et bl y l ( n/ c r )

‘Strawberry Festival’ 2005 Season

3 2 1 0 60 100 Nit gen r t ( I ASr c omendat n) o r a e %F e m io 140

Summary
 

Inconsistent results over time. No differences among irrigation rates:


Exploring irrigation frequencies???



N rates had an effect depending on cultivar:


‘Strawberry Festival’ increased with rate.



Future research will focus on fertilization and irrigation programs.

Thank you!


								
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