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Expert Co. Residential district in Naples/Ft. Myers for assistance in applying the fertilization treatments. This study was funded internally by the Davey Resource Group, a division of the Davey Tree Expert Company, Kent, Ohio.

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habanero pepper that indicate an adequately fertilized protocol. Fruit yield and quality depend on fertilization among other agricultural inputs ( Epstein and Bloom, 2005 ; Raese and Drake, 1997 ). Even at low levels, fertilization often enhances yields

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fertilization failure caused by self-incompatibility or cross-incompatibility, and embryo abortion ( Liang et al., 2005 ). According to the results of previous studies, the pollen of Z. jujuba Mill. ‘Zhongqiusucui’ was fertile and its pollen germination rate

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Field experiments were conducted to examine the effect of fertilization and short periods of drought on the out-of-season winter crop in prickly pear [Opuntia ficus-indica (L.) Mill.]. In addition, the winter and summer crops were compared regarding floral bud production and fruit characteristics. Under both continuous fertigation (N, P, K applied with the irrigation water) and continuous irrigation, the number of floral buds per plant was much lower in the winter than in the summer crop. Fertilization increased production of floral buds in both crops, but to a greater extent in the winter crop. The increase in floral bud production in fertilized plants was associated with an increase in NO3-N content in the cladodes. Suspension of fertigation for 4 or 8 weeks immediately after the summer harvest decreased cladode water content and delayed and reduced floral bud emergence as compared with continuous fertigation (control) or late drought (4 or 8 weeks) applied 4 weeks after the summer harvest. The plants subjected to early drought suffered from high mortality of floral buds. The fruits of the winter crop ripened in early spring, following the pattern of floral bud emergence the previous autumn. Mean fresh weight and peel: pulp ratio (w/w) were higher in fruits that ripened in the spring (winter crop) than in fruits that ripened in the summer.

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Abstract

In the Feb. 1987 issue of HortScience 22:34-36, I was interested in the paper by Charles A. Mullins entitled “Effects of Nitrogen Fertilization on Production of Mechanically Harvested Snap Beans”. However, I found that two very important items of significance were not given:

  1. The form of N applied was not given. It would be assumed that the N fertilizer was applied at seeding, although this was not specifically indicated. The form of N can have a marked effect on the response of snap bean to applied N.

  2. Soil-testing information was given, but no identification of the method of extraction. Therefore, the values reported are meaningless without knowing how the test result was obtained. Such details are significant if the reader is to use the findings reported.

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amounts of the micronutrient Zn ( Smith et al., 1980 ; Swietlik, 2002 ; Wood, 2007 ), and it is estimated that ≈30% of operational costs of pecan orchards is for nitrogen (N) and Zn fertilization ( Secretaria de agricultura, ganaderia, desarrollo rural

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). Burkholder et al. (1992) reported surface-water quality degradation at nitrate (NO 3 − ) levels as low as 0.05 to 0.1 mg·L −1 . Excessive or poorly timed fertilization of residential landscapes can result in water quality degradation as nutrients

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( Kingston et al., 2017 ; Machado et al., 2014 ; Puls, 1999 ; Retamales and Hancock, 2012 ). Despite the great influence of fertilization strategies on the root-zone environment, limited research has evaluated nutrient management strategies using

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fertilization, often accounting for up to half of annual N applied ( Bauer et al., 2012 ). Many practitioners and researchers consider the ideal N application timing to be shortly after shoot growth ceases, a timing referred to as late-fall N fertilization

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. Increased N during fertilization increased plant biomass and N uptake and improved flower quality of some species, but it also increased nutrient leaching and decreased uptake efficiency ( Bi and Scagel, 2008 ; Bi et al., 2007 ; Chang et al., 2012

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