A Pot trial was conducted to evaluate the effects of 5 controlled-release fertilizers, as single basal application at 1.6 g N /pot, on soil nitrogen supply, rice growth and NPK utilization efficiency. Results showed the N release rate of controlled-release fertilizer BCUF, BNF and BLF treatments were higher than that of conventional specific fertilizer(SRSF) treatment within 30 d after transplanting, and kept relatively sufficient N supply during medium and late of rice growth. As the results of higherproductive tiller percentage and seed setting rate, BCUF, BNF and BLF treatments increased yield of rice grain by 21.56%, 6.36% and 5.51% respectively over the SRSF treatment. Meanwhile, treatments of the three control-release fertilizers respectively increased N utilization efficiency by 69.76%, 23.62% and 15.23%, P utilization efficiency by 28.24%, 7.49% and 10.95%, K utilization efficiency by 21.53%, 10.03% and 19.02% in comparison to the SRSF treatment. On the other hand, treatments of the other two controlled-release fertilizers BTF and BAF, probably due to their too slowly supply of N thus limiting both tiller and panicle development, significantly decreased the number of panicles and spikelets per panicle, resulting in yield decrease up to 9.15% and 28.66% respectively. In addition, N, P and K utilization efficiency of BTF and BAF treatments was significantly declined.
TANG ShuanhuXIE ChunshengCHEN JianshengXU PeizhiZHANG Fabao
. Effects of controlled-release fertilizers on rice growth[J]. Chinese Agricultural Science Bulletin, 2004
, 20(1)
: 149
-149
.
DOI: 10.11924/j.issn.1000-6850.0401149
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