329 research outputs found
Fertilizing Gardens in South Dakota
Gardens can provide high quality vegetables, fruits, and flowers if the crops are given adequate nutrients and water and insect, weed, and disease control. This fertilizer guide covers part of your garden\u27s needs-optimum nutrients for yield and quality of garden plants
Crop Nutrient Considerations for Wet or Flooded Fields
Many South Dakota fields have standing water with saturated soil conditions this spring. These wet soil conditions can have implications for existing soil nutrients and for nutrients applied for this season
Nitrogen Requirements of Crops
Nitrate Nitrogen (NO₃-N) in the top 2 ft of soil is normally used as efficiently by crops as fertilizer nitrogen. Therefore when nitrogen fertilizer recommendations are made, the NO₃-N soil test level is subtracted from the total nitrogen requirement of the crop. The nitrogen required by most crops grown in South Dakota has been determined by extensive field calibration studies over the past 20 years by SDSU soils researchers (Table 1)
Fertilizing for Grass Seed Production
Seed production from grass is highly dependent upon favorable moisture and good soil fertility. Both moisture and fertility must be present; one does little good without the other. A good grass seed crop needs about the same amounts of nutrients as either corn or oats. Table 1 shows relative comparisons of nutrients taken up by comparable-yielding crops. Successful grass seed production also requires an adequate stand, weed control, and use of adapted varieties. These are discussed in C 244, Grass Seed Production: Guidelines, available from your county Extension agent
Transcription of Nonrepeated DNA in Neonatal and Fetal Mice
The transcription of nonrepeated DNA sequences was measured by hybridization of RNA from neonatal and fetal mice to mouse DNA using three different techniques. The measurements indicate that a large part (about 70%) of the rapidly-labeled fetal RNA is transcribed from nonrepeated DNA sequences. It appears that more than 12% of the single-copy DNA sequences are represented in the RNA of newborn mice
Spatially resolved spectra of 3C galaxy nuclei
We present and discuss visible-wavelength long-slit spectra of four low
redshift 3C galaxies obtained with the STIS instrument on the Hubble Space
Telescope. The slit was aligned with near-nuclear jet-like structure seen in
HST images of the galaxies, to give unprecedented spatial resolution of the
galaxy inner regions. In 3C 135 and 3C 171, the spectra reveal clumpy emission
line structures that indicate outward motions of a few hundred km s
within a centrally illuminated and ionised biconical region. There may also be
some low-ionisation high-velocity material associated with 3C 135. In 3C 264
and 3C 78, the jets have blue featureless spectra consistent with their
proposed synchrotron origin. There is weak associated line emission in the
innermost part of the jets with mild outflow velocity. These jets are bright
and highly collimated only within a circumnuclear region of lower galaxy
luminosity, which is not dusty. We discuss the origins of these central regions
and their connection with relativistic jets.Comment: 15 pages incl Tables, 12 diagrams, To appear in A
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