Growth, yield and nitrate content of sorghum, sudangrass and guineagrass in the field with heavy application of cattle manure
1998
Mizukami, Y. (Aichi-ken. Agricultural Research Center, Nagakute (Japan)) | Kanbe, M. | Houmura, I. | Kukaya, K.
We investigated the growth, yield and nitrate content of sorghum, Sudangrass and Guineagrass in the field having twice or four times more cattle mature than standard field. Manure considered of matured cattle manure compost with sawdust (mature compost) and new cattle manure (immature compost). We also analyzed the total N content of soil after incorporating the manure. 1) Early growth of all examined grasses was better in field heavily applied with manure than in the control (standard application of chemical fertilizers), although growth just after germination was not so good; heading started 2 to 3 days earlier than the control by heavy manure application. 2) In case of using immature manure to Sorghum, the yield decreased in comparison with the control. The yields of Sudangrass and Guineagrass increased with the increase in the applied manure. 3) Nitrate contents of plant were varied according to their growth stage. In all the tested grasses, they were higher than 0.2% which is dangerous threshold to livestock in vegetative growth period. After the coming out of flag leaf, they were decreased under 0.02%. Nitrate contents of plants cultivated in soil With the mature compost were lower than that of the control even growing stage. 4) There was a correlation between SPAD value and nitrate content in the heading stage. Particularly, Guineagrass and Sorghum (Sudangrass type) had a statistically significant coefficient of regression. 5) Total-N content in the field applied with heavy manure was comparatively higher than that of the control after cultivation. It suggests that successive heavy manure application would cause environmental stress
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