Two field experiments were carried out at the Farm of Nubaria Agricultural Research Station, Agricultural Research Center (ARC), Giza, Egypt, representing the newly reclaimed desert land of North West, Egypt in Nubaria, which located at 46 Km South West of Alexandria city to study the effect of irrigation regimes and NPK fertilization, earliness parameters, seed cotton yield, its components of Egyptian cotton (Gossypium barbadense L.) cultivar Giza 94 was used which represent long staple Egyptian cotton category in the two summer growing seasons of 2017 and 2018. The experimental design was a split-split plot with four replications, where the irrigation regime treatments were allocated to the main plots and the sub-main plots included NPK fertilization, while foliar application treatments were taken place in sub-sub plots, where irrigation regimes were irrigation at 50% depletion of available soil moisture. (I1), irrigation at 70% depletion of available soil moisture (I2) and irrigation at 90% depletion of available soil moisture (I3). While NPK-fertilizer rates were 100% of NPK recommended doses (75 kg N, 31 P 2 O 5 and 48 K 2 O/fad.), 75% of NPK recommended doses (56.3 kg N, 23.3 P 2 O 5 and 36 K 2 O/fad.) and 50% of NPK recommended doses (37.5 kg N, 15.5 P 2 O 5 and 24 K 2 O/fad.). Foliar application treatments were control (water), potassium silicate (two times at the rate of 1 kg/fad., before flowering and two weeks later), extractable mixed of algae, amino acids and micronutrients (two times at the rate of 1 L/fad., before flowering and two weeks later).The results revealed that growth and yield attributes of cotton were affected by water stress under NPK fertilization and foliar application, in this respect the highest value of growth, yield characters were achieved under irrigation regime (50% depletion of available soil moisture) and recommended dose of NPK and foliar application of Algal extracts + amino acids + micronutrient) under Nubaria conditions.
Two field trials were conducted in a highly calcareous sandy clay loam soil at Nubaria Agric. Res. Station, Agric. Res. Center, Alexandria governorate, Egypt during 2012 and 2013 seasons to study the effect of some sources of potassium fertilizer, soil and foliar potassium application treatments on growth, earliness, yield and its components of Egyptian long staple cotton cultivar Giza 86 (Gossypium barbadense, L.). Potassium fertilizer was added according to the experimental treatments (source, rate, method and date of application). Potassium sulphate (48% K 2 O) was applied at the rate of 24 and 2.4 kg K 2 O/fed., for the soil and foliar applications, respectively. Potassium humate fertilizer (20% humic acid and 8% K 2 O) was applied at the rate of 2 and 1 L/fed., for the soil and foliar applications, respectively. Potassein fertilizer (30% K 2 O and 10% P 2 O 5 ) was applied at the rate of 2 and 1 L/fed., for the soil and foliar applications, respectively. The soil applications after thinning in the form of potassium source. The experimental design was a split plot with four replications. The main plots involved the three sources of potassium fertilizer namely; A-Potassium sulphates, B-Potassium humate and C-Potassein. The sub main plots involved the five treatments of potassium application namely; 1-Soil application at thinning, 2-Soil application + foliar spraying two times (at initiation of flowering and two weeks after flowering), 3-Soil application + foliar spraying three time (at squaring, initiation of flowering and two weeks after flowering), 4-Foliar spraying two times ( at initiation of flowering and two weeks after flowering) and 5-Foliar spraying three times (at squaring, initiation of flowering and two weeks after flowering). The most important results obtained could be summarized as follows:1) The all sources of potassium had significant effects on all growth attributes in 2012 and 2013 seasons.2) The potassium humate fertilizer significantly decreased No. of days from sowing to the first flower appearance as well as, to the first opening boll, boll age and consequently, increased earliness percentage.3) The treatment of potassium humate produced the highest values for No. of opened bolls/plant, boll weight and seed cotton yield/plant and consequently, the highest seed cotton yield/fed., while, the sources of potassium fertilizer did not exhibit any significant effect on No. of plants/fed., at harvest in both seasons. 4) The application times had significant effects on all growth attributes. The soil application with foliar application sprayed three times at squaring, start and peak of flowering stages, significantly, decreased days from sowing to the first flower appearance as well as, to the first opening boll and boll age, and increased earliness % compared to the other potassium application treatments, and significantly increased No. of opened bolls/plant, boll weight, seed cotton yield/plant and consequently seed cotton yield/fed. in both seasons.
A field experiment was carried out through the two growing seasons of 2021 and 2022 to find out the impact of the addition of humic acid and sulphur at soil and foliar spraying with chelated Zn and/or chelated B in addition to their interactions on cotton cultivar Super Giza 94 (Gossypium barbadense L.) grown under calcareous soil located at El-Nubaria Station Farm, Agricultural Research Center, Egypt. The layout of the experiment was a split plot design with three replications. The obtained results revealed that humic acid as well as a mixture of chelated Zn and chelated B increased numbers of monopodia and sympodia/plant, plant height at harvest, total fruiting points number/plant and total bolls number set/plant, bolls setting%, seed cotton yield /feddan, yield components and fiber length in both seasons. Bolls shedding% was decreased in this respect. Humic acid alone significantly improved fiber fineness and decreased the 1 st sympodium node. Similarly, a mixture of chelated Zn and chelated B significantly increased fiber strength. Using humic acid interacting with a mixture of chelated Zn and chelated B significantly increased numbers of monopodia and total bolls set/plant, yield of seed cotton/feddan, yield components, fiber fineness and strength in the two seasons of study. In addition, it increased bolls setting% and number of sympodia/plant only in the 1 st season. However, bolls shedding% was decreased. Addition of humic acid to the soil interacting with chelated Zn foliar spraying recorded taller plants. It could be concluded that using humic acid interacting with a mixture of chelated Zn and chelated B alleviated and counteracted harmful effects of calcareous soil in El-Nubaria region on cotton productivity of cultivar Super Giza 94.
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