Celery production has become an important factor in the economy of certain areas in Utah. In 1949 over 400 acres were harvested with an average yield of 800 crates per acre, the average return per crate being $1.80. this amounts to over half a million dollars. The crop serves as a valuable cash crop, creates a demand for hand labor, and serves as an important commercial fertilizer. Little experimental work has been done on the fertilizer requirements of celery in Utah: At the present time estimates of fertilizer need are being based upon grower practices and work done in other areas. Information is needed on the amount of ouch fertilizer element needed to give optimum yields under Utah conditions. The quality of Utah celery in the past has been one of its chief selling points in competition with celery from other areas. If a good market for Utah celery is to be maintained, the quality must be maintained or improved. In the last few years some Utah celery has become pithy and tough which is an expression of poor quality. There is widespread feeling among growers that quality of celery can be improved by fertilizer practice. As yet there is very little experimental evidence on this relationship. This study was arranged to obtain information as to the relationships that exist between yield, quality, the nutrient element content, and applied fertilizer.

Many factors that influence the growth and quality of sugar beets behave in one way under one set of conditions and in quite another under other conditions. Consequently, these factors should be considered together under a dynamic situation to find their interrelations and their influence on sugar beet yield. This study is a statistical analysis of the interaction of fertilizer and soil moisture potential with the yield of sugar beets grown in a crop rotation under different regimes of irrigation conducted over a period of seven years. The data are available for the years 1949 through 1956, from an intensive field experiment conducted under Western Regional Research Project W-29, entitled Soil-Water-Plant Relations under Irrigation. There is need of a complete statistical analysis of third order interaction for the whole cultural rotation. This third order interaction has been examined for the sugar beet crop grown in the seven years of the general cultural rotation, which includes peas, first year alfalfa, second year alfalfa, potatoes, and sugar beets.

The reclamation of muck soil is a new development in the state of Utah. Knowledge concerning the various properties and requirements of the newly-drained area in Sanpete County, Utah, is extremely limited. A need for fundamental information concerning this type of soil was the basis for the establishment of an experimental farm in this region. The fact that most organic soils respond to mineral fertilizers soon after they have been reclaimed was an important reason for starting fertilizer work on this soil as soon as it was possible to do so. This thesis reports some of the fertilizer work being conducted on the farm. The soil on which the experimental work is being conducted seems to be fairly representative of an area of about 6500 acres located near the south end of the Sanpete Valley. The muck soil has been developed here in what was originally a shallow lake, with an impervious blue clay as the bottom. The soil was formed by the growth of marsh plants, the remains of which have accumulated and have been preserved in the water. From the time the valley was settled with white people up until 1926, the area had been used for the production of native hay and for pasture. The native sedge sod was first broken up in this region in the fall of 1926. The drainage of the area was started in the fall of 1925 and consisted of constructing canals around the project to control spring flood water. A central drain was installed, through the bottom of the area, with sufficient small laterals to properly drain the soil. The development of the area for at least two years after breaking the sod has consisted of pulverizing the coarse sod, allowing sufficient time for the roots to decay, so that crops could be grown.

The importance of nitrogen in world agriculture has been known for many years. But in the past few decades the enormity of the problem of nitrogen economy has been recognized. Along with the recognition of this problem there has developed a great increase in the use of nitrogen fertilizers. Coupled with the increased use of nitrogen there has come about an increasing awareness of the problem involved in the use of nitrogen fertilizers.

京都大学 / 0048 / 新制・論文博士 / 博士(農学) / 乙第13215号 / 論農博第2864号 / 学位論文||H30||N5153(農学部図書室) / (主査)教授 川島 茂人, 教授 星野 敏, 教授 藤原 正幸 / 学位規則第4条第2項該当 / Doctor of Agricultural Science / Kyoto University / DGAM

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Cotton (Gossypium hirsutum L.) and corn (Zea mays L.) spectral reflectance holds promise for deriving variable rate N (VRN) treatments calibrated with red-edge inflection (REI) type vegetation indices (VIs). The objectives of this study were to define the relationships between two commercially available sensors and the suitable VIs used to predict N status. Field trials were conducted during the 2012-2013 growing seasons using fixed and variable N rates in cotton ranging from 33.6-134.4 kg N ha-1 and fixed N rates in corn ranging from 0.0 to 268.8 kg N ha-1. Leaf N concentration, SPAD chlorophyll and crop yield were analyzed for their relation to fertilizer N treatment. Sensor effects were significant and red-edge VIs most strongly correlated to N status. A theoretical ENDVI index was derived from the research dataset as an improvement and alternative to the Guyot’s Red Edge Inflection and Simplified Canopy Chlorophyll Content Index (SI).

In an effort to reduce application costs and to integrate plant health management strategies in soybean, growers may combine POST herbicides with foliar fertilizers or cytokinin mixtures. Field experiments were conducted at the Delta Research and Extension Center in Stoneville, MS in 2015 and 2016 to evaluate soybean [Glycine max (L.) Merr.] injury, weed control, and agronomic performance when combining blended or single-nutrient foliar fertilizers with POST herbicide applications. Field experiments were also conducted at the Delta Research and Extension Center in Stoneville, MS in 2015 and 2016 to evaluate the influence of cytokinin mixtures on soybean injury and weed control when combined with common POST soybean herbicides.

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