WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Tuesday, January 16, 2018

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5684. Rasmussen, P.E. and R.R. Allmaras. 1986. Sulfur fertilization effects on winter wheat yield and extractable sulfur in semiarid soils.. Agronomy J. 78: 421-425.
Wheat yield in response to S was affected by yield level, intesity of cropping, and S accumulation in calcic horizons. At noncalcareous wheat-fallow sites with little S accumulation within 1.8 m of the surface, progressive downward movement of S occurred over 4 yrs. At an annual crop site with a calcic horizon, substantial yield responses to residual S occurred 25 yrs after application of 270-1570 kg S/ha. The highest fertilizer use efficiency was by fertilizing every 2nd crop with 14 kg S/ha when soil tests and yield data indicate a S deficiency. T: S and N fertilization effects on grain yield and S uptake by winter wheat. Extractable S in the upper 0.6 m of soil 2 and 4 yrs after S application. Cumulative plant uptake and extractable S in soil 1 and 4 yrs after S application. Extractable S in soil profile 25 yrs after S application ceased. Wheat yield response 1960-75, as affected by S applied between 1931-50.

5744. Rasmussen, P.E., R.E. Ramig, R.R. Allmaras and C.M. Smith.. 1975. Nitrogen - sulfur relations in soft white winter wheat. II. Initial and residual effects of sulfur application on nutrient uptake and N/S ratio.. Agronomy J. 67(2):224-228.
This study determined S and N uptake and distribution in soft white winter wheat fertilized with S in combination with deficient, optimum, and excessive N. Residual uptake from 17, 34, and 68 kg of applied S/ha was evaluated in 3 subsequent wheat crops receiving optimum N fertilization. S uptake and concentration in the first crop was proportional to the rate applied, but accumulated primarily in vegetative tissue when present in excess of the amount required for grain protein. Uptake from residual S was lower than from applied S. Grain yield responses to S were poorly correlated with S concentration or N/S ratios in tissue, because of inconsistancy of S accumulation in plant parts and the dominant effect of N on yield. T: Effect of N and S fertilization on S concentration and uptake at 3 stages of growth in a first wheat crop. Effect of residual S on grain yield and S concentration in grain and straw of second, third, and fourth crops. Relationship between S concentration in mature whole plants and grain yield receiving optimum N fertilization.

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