Search Results

You are looking at 1 - 2 of 2 items for

  • Author or Editor: Hermen Malik x
  • Refine by Access: All x
Clear All Modify Search
Free access

Hermen Malik and Douglas D. Archbold

The potential for plant growth regulator (PGR) manipulation of `Chester Thornless' blackberry (fibus spp.) primocane growth was evaluated. PGR treatments included combinations of soil-applied uniconazole at 1, 5, 25, and 125 mg/plant and GA, foliar-applied one or two times at 100 ppm 3 and 4 weeks after a 25-mg/plant uniconazole application. Also, GA and BA were applied at 100 ppm alone or in combination one, two, or three times. Increasing rates of uniconazole reduced primocane length, leaflet count, and leaf, cane, and root dry weights. GA, applications reduced primocane length and increased branch elongation but failed to reverse the effects of uniconazole at 25 mg/plant, except those on branch length, leaflet count, and primocane dry weight. Only applications of BA + GA, increased both branch production and elongation and dry weights of some component tissues, while BA alone generally had no effects. Chemical names used: (E)-1-(p-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-1-penten-3-ol (uniconazole); N-(phenylmethyl)-1H-purin-6-amine (benzyladenine, BA); gibberellic acid (GA).

Free access

Hermen Malik, Douglas D. Archbold, and C.T. MacKown

Partitioning patterns of fertilizer N in container-grown `Chester Thornless' blackberry (Rubus spp.) were determined over two growing seasons following application of 15NH4 15N03. The roots and primocane tissues comprised the majority of the plant biomass each year. The N concentrations of primocane and floricane leaves were lower in 1988 than 1989, but were higher than in any other tissues each year. Foliar N values were followed by those for fruit, roots, and canes. As determined by isotope partitioning ratios, primocane cane, leaf, and fruit 15N enrichment from fertilizer N was higher than in other tissues in 1988. In 1989, when only stored 15N was available, the floricane was the most enriched, followed by the fruit and roots. Thus, newly acquired N was allocated to primocane tissues, fruit, and roots. Stored fertilizer N was allocated to all tissues from the roots and floricanes, but a significant amount remained in the floricanes. After two seasons. the plants retained only 27% of the total fertilizer N initially acquired.