Discussion on the Effect of Fertilization at Different Stages of"One Base One Topdressing"for Single Season Late Rice
Under the condition of 450 kg/hm2(26-10-15)slow release fertilizer,the effects of topdressing on grain structure and yield of late rice in different periods were studied.The results showed that compared with direct seeding,the effective spike de-creased,the grain number and thousand grain mass increased,and the yield was similar.The maximum yield was achieved by top-dressing at the end of tillering and jointing stage(July 15-20).At tillering stage(June 9 to July 9),the effective ear of topdressing in-creased,the ear type was smaller,and the yield was the lowest.Topdressing at the differentiation stage of young ear reduces the effec-tive ear and affects the yield.With the delay of topdressing time,effective ear decreased,ear type increased and yield increased.Top-dressing at the differentiation stage of spikelets(August 15)resulted in the largest spike type and highest yield.At the end of tillering(July 20),the effective ear was the largest and the ear type was small.
late rice"one base one topdressing"machine insertdirect seedingtop dressing
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