Browse on keywords: fertility nitrogen CO
Search results on 04/19/18
26. Lerch, R.N., K.A. Barbarick, D.G. Westfall, R.H. Follett, T.M. McBride, and W.F. Owen. 1990. Sustainable rates of sewage sludge for dryland winter wheat production. 2. Production and income.. J. Production Agric. 3:66-71.
A sewage sludge application rate of 3 T/ac on hard red winter wheat increased gross income by an average of $45/ac/year compared to wheat grown with the typical 50-60 lb fertilizer N/ac. This was primarily due to premiums paid for higher grain protein. Grain levels of P an Zn were increased by sludge application, while levels of Cd, Ni, and Pb have remained low.
82. Lerch, R.N., K.A. Barbarick, D.G. Westfall, R.H. Follett, T.M. McBride, and W.F. Owen. 1990. Sustainable rates of sewage sludge for dryland winter wheat production. 1. Soil nitrogen and heavy metals.. J. Production Agric. 3:60-65.
This study determined that a 3 T/ac rate was the maximum allowable for the dryland wheat-fallow system. The sludge significantly increased heavy metal concentrations in the soil at all loading rates. Increased ntirates in the root zone resulted from a 12 T/ac sludge rate, compared to a 50 lb N/ac fertilizer application.
4077. Mason, J.L. and J.E. Miltimore. 1959. Increase in yield and protein content of native bluebunch wheatgrass from nitrogen fertilization.. Canadian J. Plant Sci. 39:501-504.
Native bluebunch wheatgrass in Okanagan Valley (11" precip.) showed marked response to nitrogen fertilization. Dry matter production doubled with 60N added as ammonium nitrate, protein increased from 3.9 to 6.2 %. Fertilizer also increased ground cover by the desirable grasses.
5396. Jackson, G.D. and J.R. Sims. 1977. Comprehensive nitrogen fertilizer management model for winter wheat.. Agron. J. 69:373-377.
6301. Singh, R.A., O.P. Singh and M. Singh. 1976. Effect of soil compaction and nitrogen placement on weed populations.. Plant and Soil, 44:87-96.
Field experiements showed that soil compaction did not affect wheat yield significantly under rainfed conditions. Weed population was significantly reduced due to soil compaction. Compaction decreased total moisture use and increased water use efficiency. Weed population was not affected due to nitrogen placement. Under rainfed conditions, deep placement of nitrogen was important for increasing the efficiency of fertilizer as well as water utilization by wheat crop.
8598. Vaughan, B., D.G. Westfall, and K.A. Barbarick. 1990. Nitrogen rate and timing effects on winter wheat grain yield, grain protein, and economics.. J. Production Agric. 3:324-328.
The study compared winter wheat grain yields, protein, and economic returns associated with fall, spring, and split applications of N fertilizer at rates of 0, 20, 40, and 60 lb N/ac at 19 sites over 3 yr in eastern Colorado. Spring-applied N increased grain yields and protein more than fall- and split-applied N. About 1.2 lb N/ac fall applied were equal to 1 lb N/ac spring applied to achieve similar production. Spring-applied N was the most profitable choice.
9444. Kitchen, N.R., D.G. Westfall and G.A. Peterson. 1989. Potential N and C mineralization in dryland no-till cropping soils as influenced by N fertilization management.. Agronomy Abstracts, Amer. Soc. Agron., Madison, WI. p. 244..
A study was conducted to determine the effects of N fertilization on potential mineralization of N and C in no-till cropped soils. A 30 day incubation was performed on soils from Sterling and Stratton, Colorado, sampled at 0-5 and 5-15 cm depths over and between crop rows. Nitrogen fertilization treatments were banded and broadcast UAN at 0, 34, and 90 kg N/ha. Net N mineralization rate was approximately 0.5 mg N/kg /soil-day greater in the Stratton 0-5 cm soil over the row than between the row. The same trend was found with C mineralization rates. Sterling soil from the 5-15 cm depth decreased in the ratio of C/N mineralized with increasing rate of N fertilization, but was not different as a result of fertilization placement. The results of this study illustrate the interaction of N and C turnover in soils.
9764. Varvel, G.E., J.L. Havlin and T.A. Peterson. 1989. Nitrogen placement for winter wheat in three fallow tillage systems.. Soil Sci. Soc. Am. J. 53:288-292.
Increased soil water storage with increasing amounts of surface residue in winter wheat-fallow cropping systems has not consistently resulted in higher grain yields in the Great Plains. Earlier results had suggested increased amount of surface residue may increase N immobilization and limit N availability, thereby reducing potential for use of the additional stored soil water. This study was conducted to determine if N placement below the zone of organic matter or surface residue accumulation would reduce N immobilization and increase yields.