Yield effect of applying earthworm castings produced during the oilseed rape-growing season in rice-oilseed rape cropping fields to rice

Scientific Reports
Min HuangNorman Uphoff

Abstract

In-field earthworm density can be increased by planting oilseed rape during the non-rice growing season as compared to maintaining the rice-growing fields in fallow. This study was conducted to determine the effect on rice yield of earthworm castings produced during the oilseed rape-growing season in rice-oilseed rape cropping fields and to identify the critical factors that contribute to the yield effect. Field microplot experiments were conducted in 2016 and 2017. In 2016, a rice cultivar was grown under a factorial combination of absence (EC0: 0 kg m-2) and presence of earthworm castings (EC1: 17 kg m-2) with three N application rates (9, 12 and 15 g m-2). In 2017, nine rice cultivars were grown under EC0 and EC1 with the moderate N rate as was used in 2016. Results showed that application of earthworm castings produced during the oilseed rape-growing season in rice-oilseed rape cropping fields had a significant positive yield effect on rice. This was attributed to increased panicle m-2 and total aboveground biomass while spikelets panicle-1, spikelet filling percentage, grain weight, and harvest index were not affected. Our study indirectly provides a new evidence that oilseed rape is an excellent previous crop for cereals.

References

Jan 18, 2006·The New Phytologist·Jianchang Yang, Jianhua Zhang
Sep 16, 2014·Scientific Reports·Jan Willem van GroenigenKees Jan van Groenigen
Sep 27, 2016·ISPRS Journal of Photogrammetry and Remote Sensing : Official Publication of the International Society for Photogrammetry and Remote Sensing (ISPRS)·Geli ZhangChandrashekhar Biradar

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