EFFECTS OF CONTROLLED - RELEASE POTASH FERTILIZER ON GROWTH AND YIELD OF CUCUMBER IN THAI NGUYEN

Phân bón nhả chậm có kiểm soát đã được nghiên cứu và sử dụng ngày càng rộng rãi, việc phát triển các loại phân nhả chậm hoặc có kiểm soát mới là rất quan trọng. Nghiên cứu này được thực hiện vào vụ Đông - Xuân năm 2019 để đánh giá ảnh hưởng của phân bón kali nhả chậm đến sinh trưởng, phát triển và năng suất dưa chuột Amata765 trồng tại huyện Đồng Hỷ, tỉnh Thái Nguyên. Nghiên cứu được bố trí theo phương pháp ngẫu nhiên hoàn chỉnh với 04 công thức và 03 lần nhắc lại. Ba công thức phân bón nhả chậm với các liều lượng khác nhau là 120 kg K2O/ha, 84 kg K2O/ha, và 60 kg K2O/ ha được sử dụng để so sánh với công thức đối chứng sử dụng phân thông thường (120 kg K2O/ha). Kết quả nghiên cứu cho thấy công thức sử dụng phân bón nhả chậm với liều lượng 84 kg K2O/ha phù hợp cho sự sinh trưởng, phát triển của cây dưa chuột tại huyện Đồng Hỷ, tỉnh Thái Nguyên. Tại công thức này, mặc dù thời gian sinh trưởng cần lâu nhất (70 ngày), kết quả ghi nhận các chỉ số về tăng trưởng cao nhất như số quả cho một cây (29.1), độ dài của quả (20,13cm), đường kính của quả (4,16 cm), và độ dày thịt của quả (1,36 cm). Bên cạnh đó, tại công thức này còn ghi nhận năng suất thực thu cao nhất (19,81tấn/ha) trong cả 4 công thức thí nghiệm.

The role of potash fertilizer and biopreparation in increasing the yield of winter wheat grains

Relevance. In conditions of low-fertile sod-podzolic sandy soils, they worked out the opportunity to obtain stably high yields of winter wheat grains of Moskovskaya 39 variety, many works are devoted to the effect of nitrogen fertilizer on yields in the scientific literature, and in the situation of radioactive pollution, the study of the role of potassium fertilizer and biological preparation in increasing the yield of winter wheat grains becomes especially important.Results. It was found that the use of potash fertilizer on the background of high doses of nitrogen-phosphorus fertilizer was justified, a strong connection was found (r = 0.71), between increasing doses of potash fertilizer and yield, the use of the biological preparation Humistim strengthened this connection (r = 0.90). It was revealed that the highest grain yield of 5.54 tons/ha of winter wheat on sod-podzolic sandy soils with low content of exchange potassium was obtained using the organo-mineral fertilizer system, the payback of 1 kg d.v. of the introduced full mineral fertilizer in the norm N120P90K150 was 7.78 kg of the winter wheat grain yield increase.

Potash fertilizers in the productivity of fodder crops in conditions of radioactive contamination of the territory

Relevance. In the situation of radioactive contamination, the main factor in reducing the transition of radionuclides from soil to green feed is the use of potash fertilizer, the effect of which on the yield of fodder crops in light soils with low local fertility is not sufficiently studied, therefore, the goal of the studies is to establish the role of potash fertilizer in increasing the yield of fodder crops.Methods. Studies were carried out on lupine yellow, alfalfa variable, sudanese grass, millet, stockade beast, meadow timothy, annual raigras, oats, reed double-tine, meadow oatmeal, national team hedge in the south-west of the Bryansk region on floodplain sod cucumber, sod-podzolista.Results. The highest productivity of 23.1–26.2 t/ha of green mass was found when cultivating yellow lupin. It was found that the best efficiency of fertilizer systems in the cultivation of fodder lands was revealed on floodplain sod stubble sandy soil, for each added kg received from 59.0 to 72.5 kg of crop increase.

Effects of Potassium Application and Straw Returning on Potassium Management and Benefit of Banana

HighlightsThe effects of potash fertilizer and straw returning on a banana orchard were studied by field experiment.Fertilizer with straw was more conductive to potassium nutrient balance and improved banana yield and quality.The economic benefits of straw replacing different amounts of potassium fertilizer were compared.Abstract. To explore the effects of potash fertilizer and straw returning in banana production, a field experiment was carried out, and four treatments were set up: NP fertilizer (NP), NP fertilizer and banana straw (NP+St), NPK fertilizer (NPK), and NPK fertilizer and banana straw (NPK+St). Through the soil potassium balance, the effects of potash fertilizer and straw returning on the yield, quality, and economic benefits of bananas were studied. The results showed that the application of potash fertilizer and straw could improve banana yields. Compared with the NP treatment, the banana yields of the NP+St, NPK, and NPK+St treatments increased by 17.5%, 50.5%, and 71.6%, respectively. The order of banana yield, potassium balance coefficient, and nutrient accumulation was NPK+St > NP+St > NPK > NP. The NPK+St treatment also improved the recovery rate and agronomic utilization rate of potash fertilizer, which were higher than that of potassium application without straw (NPK) and straw application without potassium (NP+St). Potassium application with straw improved the banana yield, increased the total accumulation of nitrogen, phosphorus, and potassium, and improved the efficiency of potash fertilizer uptake by the crop. Therefore, this study demonstrates the importance of straw for maintaining the soil potassium balance in banana production. The input cost of potassium fertilizer was reduced, and the resource utilization of banana straw was realized by straw returning, which can be promoted in local agricultural production. Keywords: Banana, Potassium application, Potassium balance, Straw returning, Yield.

Study of the process of obtaining liquid complex fertilizers

It is shown that possible in principle to obtain new effective forms of liquid complex fertilizers based on the products of nitric acid decomposition of phosphorite flour, ammonium nitrate, potassium chloride of the UE of the Dekhkanabad potash fertilizer plant and ammonium humate from the oxidized coal of the Angren deposit. On the basis of the conducted research, the optimal technological parameters and conditions for obtaining new forms of complex fertilizers were established.

Vine Removal Prior to Harvest, and Curing Duration and Temperature Affect the Incidence and Severity of Internal Necrosis in ‘Covington’ Sweetpotato

Internal necrosis (IN) is a physiological disorder that affects Covington, the most commonly grown sweetpotato (Ipomoea batatas) cultivar in North Carolina. Because IN affects the quality of sweetpotato storage roots, studies have been conducted since the first report of IN in 2006. Field studies (three in 2016 and two in 2017) were conducted to evaluate preharvest and postharvest treatments on the occurrence of IN in ‘Covington’ storage roots. Four preharvest treatments consisted of combinations of high chlorine or minimal chlorine potash fertilizer and mowing vs. not mowing before harvest. For postharvest treatments, 30 storage roots were obtained at harvest from each preharvest treatment plot and immediately cured in 75 and 85 °F rooms for a duration of 0.5, 1, 2, 3, and 5 weeks in 2016, and 0.5, 1, and 2 weeks in 2017. Shorter curing durations (0.5 and 1 week) coincided with industry recommendations while longer durations mimicked the challenges that some commercial facilities face when cooling down temperatures of rooms after curing is supposed to be concluded. Once curing temperature and curing duration treatments were completed, roots were placed in a 58 °F storage room at 85% relative humidity until cut. A control comparison was included in which harvested roots were placed in a 58 °F storage room (no curing) immediately after harvest. The storage roots from all temperature treatments were then cut 49 to 80 days after harvest, and incidence and severity of IN visually rated. Preharvest potash fertilizer treatments had minimal or no effect on occurrence of IN. However, mowing vines before harvest in several studies reduced IN incidence when roots were cured for more than 0.5 week at temperatures of at least 75 °F. Lower temperature (75 vs. 85 °F) and shorter curing duration (0.5 vs. 1, 2, 3, or 5 weeks) resulted in reduced IN occurrence in ‘Covington’ sweetpotato.

Effectivity of Potassium and Fish Fertilizer on Leek Growth (Allium fistulosum L.)

Leek is one type of leaf vegetable that is commonly used for cooking vegetables or seasonings. Currently, it founded some problem in leek cultivation, including the production is low because the fertilization is not appropriate. The type and dosage of fertilizer can contribute to increasing production. This research aims to determine the dosage of potassium, and fish fertilizer is right for increased leek production. The research was conducted from January - March 2015 in the Berastagi experimental farm, with altitude ± 1340 meters above sea level; the soil type was andisol. Experiments using a randomized block design (RBD) factorial with three replications. The first factor is the dosage of potassium fertilizer K0 (0 kg/ha), K1 (100 kg/ha), K2 (200 kg/ha), and K3 (300 kg/ha). The second factor is dosage fish fertilizer I0 (0 kg/ha), I1 (500 kg/ha), I2 (1000 kg/ha), and I3 (1500 kg/ha). The leek variety was used is local variety. The results showed that there is an interaction between the potash and fish fertilizers on leek plant height. Application potash fertilizer (K2O) dosage of 200 kg/ha and fish fertilizer dosage of 1000 kg/ha can increase the leek plant height 56,98 cm. Application potash fertilizer (K2O) dosage of 200 kg/ha can increase the stem diameter, length of stems, length of leaves, and fresh weight per plant. Application fish fertilizer dosage of 1000 kg/ha can increase the stem diameter, leaves length, fresh and dry weight per plant