Aims: Evaluation if foliar spray of destructed cells of Spirulina platensis along with urea fertilizer can contribute to cotton (Gossypium barbadense L. cultivar Giza-94) plant growth, contents of photosynthetic pigments, seed cotton yield, seed index, earliness, lint percent, fineness (Micronair) and strength (Pressely). Study Design: Application of ascending rates of N fertilizer in 3 mainplot treatments and foliar spray with destructed cells of Spirulina platensis in 4 subplot treatments (Contained a non-treated control), with 3 replications. Place and Duration of Study: The Departments of Microbiology and Cotton Research, Sakha Agricultural Research Station, Kafr Elsheikh, Egypt (31º18′30″N & 30º48′14″E) during the two cotton cultivation seasons of years 2016 and 2017. Methodology: Urea (46% N) at 96, 144 or 192 kg N/ha was applied in two equal doses as main-plot treatments. Spirulina platensis was grown and total proteins, contents of 16 amino acids and Fe, K, Mn and P of dried destructed cells were determined and used for foliar application in the rates of 6, 12 or 18 g cells/ha, used as sub-plot treatments. Area of each replicated sub-plot was 12.5 m2. Calcium super phosphate (15% P2O5), potassium sulphate (48% K2O) and Insecticides (when necessary) were supplemented as common treatments. Results: Application of destructed Spirulina increased the plant leaf area, chlorophyll a, b, carotenoids and gibberellin contents, plant height, fruiting branches, open bolls/plant, seed cotton yield and seed index after ginning, fiber length, fineness (Micronair) and strength (Pressely) comparing to the corresponding non-sprayed plants. Urea at 192 kg N/ha along with destructed Spirulina exhibited superiority as enhancers of plant growth, yield and fiber qualities. Conclusion: The dual N/Spirulina combination expressed enhanced cotton growth, yield and qualities of fibers. The tested fertilization strategy is promising for enhanced cotton production economy.
Afield experiment was carried out in a clayey textured soil (Clayey, Smectitic, Superactive, Mesic, Typic) located at Sakha Agricultural Research Station farm, Kafr El-Sheikh Governorate, Egypt (30 o 56 N latitude and 31 o 05 E longitude) to study the effect of different application methods (foliar fertilization and seed coating) with mixture of some micronutrients (Fe, Mn, Zn) and potassium humate on cotton Giza CV 94 during summer seasons of 2015 and 2016. A split plot design was used with three replicates. The main plots were assigned with three application methods: foliar application, seed coating and (foliar + seed coating). The sub plots were assigned with three treatments of Micronutrients, potassium humate and mixture of (micronutrients + potassium humate) in addition to the control treatment. The obtained results can be summarized as follow:-Plant height and number of fruiting branches were increased by (spraying + seed coating) method during the two seasons. Meanwhile the fertilizer treatment of (micronutrients mixture + potassium humate) significantly increased plant height (cm) and number of fruiting branches.plant -1 . Foliar spraying + seed coating treatment gave the highest values of number of open bolls, boll weight, seed index and seed cotton yield. fed -1 ., compared with the other two application methods. Plants sprayed or coated with mixture of (micronutrients + potassuim humate) caused a significant increase in number of bolls.plant -1 , boll weight and seed index. Mix of (micronutrients + potassuim humate) produced the highest significant values of seed cotton yield.fed. -1 , but untreated plants gave the highest values of earliness in the two season compared with other treatments. The highest values of the fiber fineness were obtained by spraying plants with mixture of (micronutrients + potassium humate). On the other hand, coating seeds with (micronutrients + potassium humate) gave the highest values of fiber strength. Mixture of (micronutrients + potassium humate) increased the concentrations of N, P, K, Mn, Zn and Fe in cotton last mature leaves. Also, the highest values of N, P, K, Mn, Zn and Fe in cotton last mature leaves were obtained when (seeds coating and foliar) was used with mixture of (micronutrients + potassium humate).
Afield trail was conducted at Sakha Agricultural research station farm, Kafr El-Sheikh governorate to study the effect of Ethrel at low concentration ( 5 cm / litre) as foliar application at different stages of bolls maturity (35, 50, 65 and 80 % ) after 120 days after sowing in addition of control ( untreated plants) on yield and its parmuters of cotton Giza 97 cultivar during 2019 and 2020 seasons.Complete randomized block design was applied with three replicates were used with five treatments. There are significant differences between all treatments by using Ethrel at the most of studie d charecters. Foliar application of Ethrel with 5cm/litre at 50% bolls maturity significantly increased number of fruiting branches, total chlorophyll, number of open bolls, earliness percentage, lint percentage, boll weight and seed cotton yield / fed. On the other hand, spraying cotton plants with Ethrel in this stage optained the lowest values of boll retention %, boll shedding in opposite of untreated plants which obtained the highest values. There are not any significant differences between all treatment in some characters as plant height and seed index which not affected by the application of Ethrel. To further improve the boll opening percentage for better yield performance same experiment was conducted using 5 cm / litre of ethrel at 50 % maturity at four times, 10 days between them ( beginning with120,130,140 and 150 DAS) .
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