Effect of sulphur deficiency on sulphur and nitrogen levels in pastures and lucerne

A sulphur response: White clover seed production

“…Data for this crop suggest that the 'critical level' for limitation to white clover growth fell between 0.11-0.14%. These figures are much lower than the 0.20-0.22% required by an actively growing ryegrasswhite clover pasture (McNaught & Crisstoffels 1961). Total S compared with (N/S), (i.e., total N % : total S %) values (Table 2) were more affected by S application, being similar to the mature lucerne results obtained by Pumphrey & Moore (1965).…”

Bio-efficacy of Organic Formulations on Crop Production-A Review

“…Meanwhile the nitrogen contents of urine-treated plants increased by 24.6% relative to untreated plants. Ramachandrudu and Thangam (2007) ( McNaught, 1961). Ledgard, et al, (1982) in New Zealand, evaluated the effects of cow urine and equivalent nitrogen, potassium, and sulphur treatments on pasture yield, botanical composition, herbage chemical composition and N fixation by clovers during winter and spring.…”

Evaluation of sulphur status of East Coast pastures of the North Island, New Zealand 1. Soil and herbage survey

“…The close correspondence in total S levels in grass and clover in this situation suggests that S contents in mixed herbage samples may be suitable for diagnosing S deficiency. Eleven out of the 28 grass samples and 14 out of the 28 clover samples had total S concentrations below the critical levels proposed by McNaught & Christoffels (1961) for near-maximum (95%) DM production (Fig 6). These critical levels are 0.23 -0.30% for grasses (depending on the N status of grasses) and 0.26% for clover.…”

“…5). According to McNaught & Christoffels (1961), a situation where total S in clover exceeds or approximates that in grass indicates S deficiency. The close correspondence in total S levels in grass and clover in this situation suggests that S contents in mixed herbage samples may be suitable for diagnosing S deficiency.…”