Crop rotation combined with controlled-release fertilizer promoted the
utinization of the reclaimed land along Yanze River through improving
soil fertility and nutrients use efficiency
Abstract
Although fertilization of controlled-release fertilizer (CRF) and crop
rotation have been shown the contribution to improving yield, nutrient
use efficiency, and soil fertility, their interactions on the quality of
relcalimed land remains unclear. Hence, a field experiment was conducted
in a reclaimed land along Yangze River to investigate their
interactions. Results indicated that application of bulk blending urea
(BBU) of conventional urea and controlled-release urea (CRU) with
appropriate dosage and frequency increased the rice yield and nitrogen
agronomic efficiency (NAE). Crop rotation also improved the rice yield
and NAE through enhancing the retention capability of fertility. Crop
rotation combined with fertilization significantly increased the soil
pH, organic carbon (SOC), total N (TN), and permanganate oxidizes carbon
(POXC). The rice-green manure (RG) rotation improved soil pH and TN
most, and the rice-rape (RR) rotation improved SOC most. Fertilization
of conventional urea and BBU both significantly increased the labile SOC
functional groups and reduced the the stabled SOC functional groups
under RG rotation. Under RR rotation, however, only fertilization of
conventional urea increased the labile SOC functional groups and reduced
the the stabled SOC functional groups. The rice-wheat (RW) rotation
showed no significant effects on the changes in soil organic functional
groups. The changes in soil properties had significant effects on
improving rice yield or NAE under RG and RR rotations instead of RW
rotation. The findings suggested that BBU combined with crop rotations
could make good use of reclaimed land through improved nutrient use
efficiency and soil fertility.