Field-Scale Evaluation of Biosolids-Derived Organomineral Fertilisers Applied to Ryegrass (Lolium perenne L.) in England

Table 1

Parameters derived from the response of the grass crop to the application of fertiliser-N in 2009 and 2010.

Parameter	Mean DMY	SD	Response	𝑃 value	R^2	DMYmax	Nmax	DMY10	N10	Agronomic efficiency
Unit	kg ha^−1	kg ha^−1	—	—	—	kg ha^−1	kg ha^−1	kg ha^−1	kg ha^−1	kg kg^−1
Treatment	2009
Control	6188^a	126	—	—	—	—	—	—	—	—
Biosolids	9285^b	1389	𝑦=6406+24.6𝑥−0.03𝑥^2	<0.001	0.74	11986	455	11060	270	18.0
OMF10	11270^c	1330	𝑦=6576+53.8𝑥−0.12𝑥^2	<0.001	0.87	12460	219	12255	180	33.7
OMF15	11958^d	1643	𝑦=6547+56.9𝑥−0.11𝑥^2	<0.001	0.94	13798	255	13574	210	35.2
Urea	12230^d	1778	𝑦=6586+60𝑥−0.12𝑥^2	<0.001	0.89	14027	248	13820	207	36.9
Treatment	2010
Control	2192^a	204	—	—	—	—	—	—	—	—
Biosolids	5394^b	1287	𝑦=2435+26.6𝑥−0.04𝑥^2	<0.001	0.78	7266	364	6581	227	14.1
OMF10	6624^c	1080	𝑦=2532+46.9𝑥−0.11𝑥^2	<0.001	0.90	7651	218	7418	172	25.8
OMF15	7385^d	1266	𝑦=2396+63.6𝑥−0.17𝑥^2	<0.001	0.92	8500	192	8348	162	32.1
Urea	7357^d	1240	𝑦=2523+58.4𝑥−0.14𝑥^2	<0.001	0.90	8477	204	8302	170	30.4

Mean DMY is annual dry matter yield across all 𝑁 application rates, and SD is the standard deviation. For mean DMY, different letters indicate values that are significantly different at a 95% confidence interval.