In these trials, the highest tiller and root production was
achieved from using younger seedlings (12 days) raised in
a dry seedbed, whether transplanted into flooded or nonflooded
soil, due to better root growth (Fig. 2). This
adaptive trait could be exploited to manage rice crops with
reduced water applications without compromising grain
yield. However, because these factors are all highly interactive,
this relationship should be assessed further with
different soil and varietal characteristics and under different
climatic condition to get better predictive power.
These findings also indicated that for both kinds of
nurseries—and after transplanting under either flooded or
non-flooded soil conditions—transplanting younger seedlings
led to greater root length density, especially when
they had been raised in a non-flooded nursery (dry seedbed)
and were then transplanted into non-flooded soil. We
saw that younger seedlings raised in a non-flooded nursery
also had considerably higher nitrogen in their shoots.
Conversely, older seedlings kept in the nursery longer and
transplanted at 30 days, whether coming from non-flooded
or flooded nursery plots, had better root growth when
transplanted into a flooded field.
This observation could help explain in part why the
flooding of rice paddies has become so widespread. A
dominant reason for flooding is to control weeds, and
thereby to reduce labor requirements. According to our
findings, when farmers used older seedlings they would
observe better root growth and crop performance under
flooded soil conditions, which would appear to justify their
practice of flooding.
In these trials, the highest tiller and root production wasachieved from using younger seedlings (12 days) raised ina dry seedbed, whether transplanted into flooded or nonfloodedsoil, due to better root growth (Fig. 2). Thisadaptive trait could be exploited to manage rice crops withreduced water applications without compromising grainyield. However, because these factors are all highly interactive,this relationship should be assessed further withdifferent soil and varietal characteristics and under differentclimatic condition to get better predictive power.These findings also indicated that for both kinds ofnurseries—and after transplanting under either flooded ornon-flooded soil conditions—transplanting younger seedlingsled to greater root length density, especially whenthey had been raised in a non-flooded nursery (dry seedbed)and were then transplanted into non-flooded soil. Wesaw that younger seedlings raised in a non-flooded nurseryalso had considerably higher nitrogen in their shoots.Conversely, older seedlings kept in the nursery longer andtransplanted at 30 days, whether coming from non-floodedor flooded nursery plots, had better root growth whentransplanted into a flooded field.This observation could help explain in part why theflooding of rice paddies has become so widespread. Adominant reason for flooding is to control weeds, andthereby to reduce labor requirements. According to ourfindings, when farmers used older seedlings they wouldobserve better root growth and crop performance underflooded soil conditions, which would appear to justify theirpractice of flooding.
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