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Wednesday, October 17, 2018

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1917. Evans, M.W.. 1911. Field pea production in WA.. WA Agr. Expt. Sta. Bull. #99.
Covers: description; adaptation to climate and soils; varieties; yields; utilization - feeding seed and straw, hay, pasturing, soiling, seed production, for rotation; cultivation; harvesting

500. Atkinson, A.. 1907. Canadian field peas.. Montana Agr. Expt. Sta. Bul. 68.

816. Bezdicek, D.. no date. (Influence of residual soil N on N2 fixation; N2 fixation of chickpeas). unpublished.
High levels of residual soil N decreased N2 fixation. There was a negative correlation between the fraction of plant N derived from N2 fixation and total mineralizable N and KCl extractable N. N2 fixation was reduced by about 2.8 kg/ha for each kg/ha of available soil N. Seed yield response from inoculation ranged from 5-70% and was negatively correlated with available soil N. Residual soil moisture in July was greatestfor large seeded legumes > forage legumes > winter wheat. T: N fixation in chickpeas.

3935. Mahler, R.L., D.F. Bezdicek, and R. Witters. 1979. Influence of slope position on nitrogen fixation and yield of dry peas.. Agronomy J. 71:348-351.
Total seasonal N2 fixation estimates: bottomland - 69; south slope - 22; ridgetop - 17 kg N/ha. Pea yields were 2100 kg/ha for the bottomland and 480 kg/ha for the ridgetop, and were related to soil moisture depletion of 22 cm and 9 cm respectively. Greater plant N and DM were obtained in the greenhouse when peas were inoculated with Rhizobium isolates from the north slope when compared to other isolates. T: soil water depletion

3955. Mahler, R.L. and D.L. Auld. 1989. Evaluation of the green manure potential of Austrian winter peas in northern Idaho.. Agron. J. 81:258-264.
Austrian winter peas were evaluated as a green manure (GM) or seed pea (SP) crop, along with soil N levels, and subsequent yields of winter wheat (WW) and spring barley (SB). Four rotations were tested: GM-WW-SB; SP-WW-SB; SB-WW-SP; SF-WW-SB. Average N fertilizer equivalent values of 94, 75, and 68 kg/ha were provided by GM, SP, and SF (fallow) respectively, to the following wheat crop. Yield differences due to crop rotation or N fertilization rate were not observed in the third year of the cropping sequence. Austrian winter peas used as either a GM or SP provided more inorganic N than SF or SB. Although cereal crop yields were comparable, the SP-WW-SB was more profitable than GM-WW-SB or SF-WW-SB, due to the extra harvested crop.

4022. Mahler, R.L.. 1990. Nitrogen database project - final report.. unpublished report for Dryland Cereal/Legume LISA project.
This project had two components: 1) development of a comprehensive database on winter wheat response to nitrogen fertilizer rates; 2) evaluation of the potential of peas, alfalfa, and wheat straw as nitrogen sources for a following wheat crop in rotation. The database study examined winter wheat yield response to 41 nitrogen rates. When soil test N + mineralizable N + fertilizer N ranged from 101 to 175 kg/ha, a requirement of 2.75 lb N per bushel of wheat was calculated. This agrees with the figure calculated by Leggett in the 1950's, indicating that modern varieties have not changed in their basic nitrogen requirement, when nitrogen fertilizer efficiency is assumed to be 50%. At total available N rates greater than 175 kg/ha, the N requirement per bushel of wheat increased dramatically. Low rates did not show a large increase in efficiency on a per bushel basis. At Moscow, N fertilizer application rates less than 95 kg/ha resulted in greater than 50% N use efficiency. Efficiency declined rapidly at rates above this. The green manure study compared alfalfa, pea, and green wheat straw residues applied at 1, 2, and 3 mt/ha. In general, higher rates of pea and alfalfa resulted in higher wheat yields. The highest yields were with the high rate of pea residue. It was more effective than alfalfa residue, probably due to faster decomposition. Alfalfa provided more N per ton of residue (31 kg/mt) than the peas (29 kg/mt), while straw added 19 kg/mt.

4321. McDole, R.E., J.P. Jones, and R.W. Harder. 1978. North Idaho fertilizer guide - Peas and Lentils.. ID Agr. Expt. Sta. CIS #448.
Describes crop needs for P,K,S and micronutients; Starter fertilizer not recommended.

5539. Ramig, R.E.. 1987. Conservation tillage systems for green pea production in the Pacific Northwest.. IN: J.F. Power (ed.). The role of legumes in conservation tillage systems. p. 93-94.
Summarizes a 13 yr study of the effects of 4 tillage systems in a pea-winter wheat cropping system on water conservation and use, yields, water use efficiency, and the changes in weed populations. Water storage on land on which wheat stubble was left standing overwinter averaged 10% more than on fall-tilled stubble. There were no significant differences in wheat yields among tillage systems. Weed infestations in peas shifted due to tillage, primarily with lambsquarters. Spring plow was worst. Conservation tillage for a wheat-pea rotation can enhance water conservation, and in dry years can increase pea yields by 20% and wheat yields by 5%. Long-term effects are not consistent due to crop residue influences.

7161. Vandecaveye, S.C. and W.H. Fuller. 1941. Studies of different cultures of Rhizobium leguminosarum and of gypsum and straw for seed pea production.. Iowa St. College Journal of Sci. 15(4):415-423.
Tested 7 cultures of Rhizobium for nodulation and yield of Alaska seed peas. Also did a pot study with wheat straw and gypsum amendments. The field soil had never had peas before, but contained sufficient Rhizobium to inoculate peas. Seed inoculation tended to increase yields, but no culture was a sufficiently good N fixer to insure vigorous growth on soils low in available N. Soil amendments did not affect nodulation or growth. Yield differences were primarily due to variation in soil productivity.

7559. Wilkins, D.E. and J.M. Kraft. 1987. Relation between seedling vigor and yield of peas.. OR Agr. Expt. Sta. Special Report 797, p. 29.

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