July 2022 - 17

IRRIGATION & WATER MANAGEMENT
The University of California initially developed the online tool CropManage for use on
iceberg lettuce. Since then, it has added several crops to include iceberg on both 40and
80-inch beds, Romaine lettuce on 40- and 80-inch beds, leaf lettuce, and red and
green baby lettuce. Photo: Vicky Boyd
CropManage nitrogen
recommendations are based on a number
of factors, including soil samples, soil
quick test results, residual plant material
in the soil, irrigation water nitrate test
results and soil mineralization. Again,
the software factors in crop growth stage
as young plants typically don't require
as much nitrogen as larger ones or those
entering the reproductive stage.
The more information the user can
provide, the more accurate the output.
Cahn said he is confident in the program's
recommendations because they have
been ground-truthed. Before a new
crop is added, he said farm advisors
conduct field trials to compare the
online recommendations to cooperating
growers' standard practices.
Ground-truthing a new crop
Among those is Zheng Wang, a UCCE
vegetable and irrigation farm advisor
in Stanislaus County who has been
working with two area growers to validate
CropManage for watermelons the past
two years. Complicating the work has
been a trend toward grafted watermelon
plants, which have different growth
patterns and larger root systems, he said.
This may change water and nutrient
requirements and timing.
Watermelons also differ from other
crops supported by CropManage as they
have a growing season that could be up
to nearly six months long compared
to processing tomatoes with 120 days.
Many of the leafy greens have only a
60-day season.
In addition, watermelons are
harvested not once but multiple times
during the season, Wang said. After
each harvest, applying additional
nitrogen and irrigation to the field
is critical to spur new growth and
continue fruit production.
" Making sure the water can be used
most efficiently without compromising
the yield is quite important, " he said.
Wang also is in his first year of groundtruthing
CropManage for processing
tomatoes on bed widths ranging from 60
to 80 inches as well as single- and doublerow
plantings.
Much of the funding to develop the
decision support tool and continue
improvements has come from California
Department of Food and Agriculture
Fertilizer Research and Education grants,
Cahn said. FGN
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FGN | JULY 2022 | 17

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July 2022

Table of Contents for the Digital Edition of July 2022

July 2022 - 1
July 2022 - 2
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