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... This study was aimed to ascertain (a) the natural occurrence of R. phaseoli in certain soils, (b) whether any relationships existed between types of nodulation and efficiencies of the strains, and (c) homogeneity of reactions among strains isolated from the same nodule. Variations among the strains in cultural and fermentative characteristics were marked, yet, on the whole, the strains isolated fr ...
beans; drying; exchangeable sodium; modulus of rupture; sandy loam soils; seedlings; strength (mechanics); California
Abstract:
... Apparatus and procedure are described for measuring the modulus of rupture of soil. Briquets approximately 1 × 3.5 × 7 cm. are formed by placing screened dry soil in brass molds, wetting for one hour by subbing and drying at 50°C. The force required to break a briquet when loaded as a horizontal beam is measured and the modulus of rupture, which is the maximum fiber stress, is calculated by the fo ...
beans; clay loam soils; conventional tillage; corn; crop rotation; crop yield; crops; deep tillage; minimum tillage; oats; planting; plows; rotary tillage; site preparation; sugar beet; vegetation; weed control
Abstract:
... Tillage experiments were conducted over a period of six years on four different types of soil; two sandy loams, a loam, and a clay loam. Crops were grown in rotation. Different implements were used to accomplish seven methods of tillage. The use of moldboard plow, followed by conventional tillage was considered as a method to be compared with three methods where machinery which mixed the existing ...
... Ineffective rhizobia have often accounted for poor growth and low yields of certain leguminous plants despite the presence of effective rhizobia in the rhizosphere. The purpose of this study was to determine the plant growth response of beans to effective and ineffective rhizobia applied at different time intervals. Precedence in the addition of the different inocula and time of harvest were also ...
... The absorption by plants of Rb from soils and sand was measured. The Rb was added to the soil as RbCl, and in the sand culture various ratios of K to Rb were used. Corn was grown in the soils and the distribution in the plant and the soil determined. Beans were grown in the culture solutions, and the distribution of K and Rb measured in the various plant parts. The percent recovery of Rb by the co ...
... The effect of liming two strongly acid Rifle peat soils on the growth and absorption of soil and fertilizer phosphorus by field beans, sudan grass, and corn was studied under greenhouse conditions. The dry weight of field beans was markedly increased by applying up to 12 tons of CaCO₃ per acre. In contrast, the growth of corn was depressed when more than 3 tons of CaCO₃ per acre was applied. Limin ...
... SynopsisIn 15 experiments, yield reductions of soybeans in weed-infested plantings averaged 3.7 bushels per acre or approximately 10% of weed-free beans when weeds were grown the entire season. Foxtail reduced bean yields slightly less than smartweed or velvet leaf. Dry matter yield of above ground parts of soybeans and weeds combined approximated that of weed-free beans alone. Effects of rainfall ...
beans; oils; protein content; racemes; seeds; soybeans
Abstract:
... SynopsisOil content of soybeans was found to vary with position of pod on the plant, position of pod on the raceme, and position of the seed in the pod. Seeds from the lower half of plants were 0.5% higher in oil and 1% lower in protein than those from the upper half. Beans near the tip of long terminal racemes had less oil than those farther down. Seed in the tip of the pod had highest oil and lo ...
... A study was made of the changes in organic C and N and in the ratio of C:N in the soil of a long-term fertility trial with citrus at the University of California Citrus Experiment Station, Riverside, during 28 years of irrigation and differential fertilization, from 1927 to 1955. All changes in organic C and N and ratio of C:N in the soil were in the surface 0 to 6 inches. Check plots that receive ...
... SypnosisGrowth of annual weeds increased markedly and bean yield reductions became more severe with soybean stands of less than 9 to 11 plants per foot of row. Bean yield reductions were more severe when weeds were left until or after stage 7 (early August). With moderate weed infestations and moisture deficits during the growing season, soybean yield reductions were less than with adequate moistu ...
... The different initial infestation of the two field bean varieties Rastatter and Schlanstedter (in the relation 1: 3 till 1: 5) by Aphis (Doralis) fabae Scop, is caused by a preference behaviour of the alates, which land on both varieties of bean in equal numbers, but whereas 99% leave Rastatter in a few minutes, only 90% leave Schlanstedter. ...
... SynopsisRotary hoeing performed when weeds were germinating but not emerged, and repeated once or twice at approximately 5-day intervals, reduced weed infestations 70 to 80% and soybean stands about 10% in solid-seeded and row-planted soybeans. Bean yields were only slightly less than those from weed-free plantings. When hoeing was delayed until weeds had emerged, both weed control and bean yield ...
... Heptachlor, chlordane, methoxychlor, lindane, aldrin, toxaphene, dieldrin, TDE, DDT, and BHC were applied to Arredondo fine sand at rates of 12.5, 50, and 100 ppm. of the active ingredient. The soil was placed in 2-gallon pots and maintained in a greenhouse throughout the study. The first crop of Stringless Black Valentine beans, planted 2 weeks after treatment, showed that BHC decreased germinati ...
... Three varieties of Field (Spring) Bean were compared in a small plot trial: Rastatt (known to be relatively resistant to Aphis fabae), Schlanstedt (very susceptible) and an English Tick Bean. Records were kept of the growth of the plants and of the day-to-day incidence of winged Aphis fabae and Acyrthosiphon pisum, with periodic aphicidal spraying to minimize damage to the plants. Schlanstedt was ...
agronomy; annual weeds; beans; crop-weed competition; plant growth; soil water
Abstract:
... SynopsisSoybean yield reductions due to annual weed infestations averaged 5% when soil moisture conditions during growing seasons were either adequate for or severely limiting to plant growth. Reductions were also small when moisture was limiting in early season and adequate later. When soil moisture was adequate until late July and then severely limiting until bean maturity, yield reductions from ...
agronomy; annual weeds; barley; beans; crop-weed competition; net blotch; plant growth; soil water
Abstract:
... SynopsisSoybean yield reductions due to annual weed infestations averaged 5% when soil moisture conditions during growing seasons were either adequate for or severely limiting to plant growth. Reductions were also small when moisture was limiting in early season and adequate later. When soil moisture was adequate until late July and then severely limiting until bean maturity, yield reductions from ...
... A black Aphis sp. on Tropaeolum can be separated, morphologically, from A. fabae Scop. In controlled experiments this aphid, both winged and wingless forms, actively selects Vicia faba as a host plant, settles to feed and reproduce, but always dies prematurely. Offspring also soon die. The aphid is unable to take up plant sap from beans. The behaviour associated with host plant selection is not ad ...
... A Bladen clay was divided into two parts and one part diluted with an equal part of sand. Both the whole and diluted soil were potted and planted to beans. Between the seedling stage and the initiation of flowering, four 1-inch applications of dilute synthetic sea water having EC values of 1, 2, 4, 6 and 8 mmho. per cm. were applied. After harvesting both pods and tops, beans were again planted an ...
... Field tests on Houghton muck and greenhouse studies on alkaline organic and mineral soils were conducted to determine the comparative effectiveness of several manganese carriers as measured by yield response and manganese content of crops. Spray, broadcast, and banding methods of application were studied in field tests and mixing vs. banding of carriers was studied in the greenhouse. Carriers used ...