A b s t r a c tSpatial and temporal variability of growing conditions which affects the production process management is characteristic of agrophytocenosis. Spatial heterogeneity of soil essential properties is widely reported. A precision fertilization should be effective tool to control crop productivity. The highest potential of such fertilization could be expected for vegetable crops in the favorable soil and climatic conditions of the Nechernozemie of North-West Russia. In a microvegetation stationary two-factor experiment, plastic bottom-less pots of 1 m 2 area were used to artificially form the upper part of the soil profile (A arable 0-22 cm and А 2 В 22-40 cm horizons) simulating natural lithogenic mosaics of agro sod-podzolic sandy, sandy loam, light loam and medium loam soils subjected to weak and good cultivation. Their minimum, maximum, and average parameters for the 0-22 cm horizon were as follows: рН KCl of 4.34-6.35 and 5.40, humus content (by Tyurin) of 0.92-2.50 and 1.72 %, labile phosphorus and potassium (according to Kirsanov) of 125-550 and 390 mg/kg and 22-400 and 209 mg/kg, respectively. The vegetable crop rotation included black radish (Raphanus sativ-. For a comparison, we used different system of fertilization, i.e. control (no fertilizers); zonal system (ZS); precision fertilization 1 (PF-1); precision fertilization 2 (PF-2). In the ZS providing for a uniform application of the fertilizers based on the average soil properties, we used lime (4.5 t/ha + N 95 Р 20 К 125 ) for black radish; manure (45 t/ha) + N 100 Р 30 К 90 for potatoes; N 130 Р 50 К 150 for beetroot; lime (2.1 t/ha) + manure (50 t/ha) + N 120 Р 10 К 90 for cabbage; and N 100 Р 40 К 130 for carrot. In the PF-1, two months before the radish was sown a precision soil cultivation has been performed using lime at 0-20 and 6.6 t/ha, peat at 0-900 and 390 t/ha; phosphorite flour at 0-750 and 94 kg/ha; potassium sulfate at 0-1710 and 407 kg/ha (as min-max and average). Further application of organic and mineral fertilizers before sowing (planting) was uniform, i.e. N 70 К 60 for black radish; manure (45 t/ha) + N 80 К 100 for potatoes; N 100 Р 30 К 130 for beetroot; manure (50 t/ha) + N 100 Р 10 К 70 for carrot; N 100 Р 10 К 120 for white cabbage. In PF-2 providing average doses of all fertilizers equal to these in ZS, but differentiated for each pot based on actual soil parameters, we used lime The experiments were arranged in four replications. In a field experiment the precision fertilization provided an increase in the productivity of vegetable crop rotation of 22.3 and 43.5 t/ha in control and ZS, respectively, to 47.9-49.4 t/ha. PF-1 and PF-2 resulted in the Сv reduction from 32 % and 16 % in the control and ZS to 9 %, and in an increased natural profitability of fertilizers by 21-49 %. A responsiveness of vegetable crop rotation to precision fertilization depended on biological features, the specific farming techniques and soil conditions. A decreasing responsiveness was as follows: black radish > car-rot beet > potatoe...
Целью комплексного исследования, выполненного в Меньковском филиале АФИ в 20122017 годах была оценка вредоносности возбудителя фитофтороза в зависимости от почвенноагрохимических и погодноклиматических условий. Методической основой исследования служил длительный полевой опыт агрофизический стационар в системе полевого и овощекормового севооборотов, в которых картофель возделывали по обороту пласта многолетних трав после озимой ржи и после ячменя. Объектами исследования служили: картофель раннеспелого сорта Ломоносовский среднеустойчивого к возбудителю фитофтороза по клубням и слабоустойчивого по ботве дерновоподзолистая почва средней, хорошей и высокой степени окультуренности и системы удобрения культуры. Супесчаная почва опыта характеризовалась рНКСl 5,26,3, содержанием гумуса 2,13,7, подвижных соединений P2О5 195676 мг/кг и К2О 97298 мг/кг. На хорошо окультуренной и высокоокультуренной почвах их поддерживали применением под картофель 35 и 70 т/га органических удобрений соответственно. Факторы исследования: степень окультуренности почвы (варианты: средняя, хорошая и высокая) и уровень применения минеральных удобрений в расчете на заданный КПД (коэффициент полезного действия фотосинтетически активной радиации) (варианты: КПД ФАР, 13 без удобрений КПД ФАР, 24 N80P20K100 КПД ФАР, 35 N120P30K150). В ходе комплексного исследования установлены параметры поражения возбудителем фитофтороза и уровень потерь урожая картофеля в зависимости от агроклиматических и почвенноагрохимических условий. Агрономическая эффективность изученных вариантов системы удобрения на культуре картофеля высокая. Уровень прибавок урожайности клубней и окупаемость 1 кг д.в. удобрений достигли 3358 и 8,311,6 з.ед. (зерновых единиц) на минеральной, 2545 и 3,98,0 з.ед. на органической и 3379 и 3,86,7 з.ед. на органоминеральной системе удобрения. В неэпифитотийных условиях (2 из 3 лет наблюдений) на фоне низких и умеренных показателей поражения общие потери урожая составляют 5, а окультуривание почвы и применение органических и минеральных удобрений снижают их на 3080. На эпифитотийном фоне, повторяющемся 1 раз в 3 года, пораженность ботвы и клубней картофеля возрастает в 4,3 и 6,1, интенсивность поражения в 2,8 и 3 и развитие в 12 и 17,5 раза соответственно. В эпифитотийные годы потери урожая возрастают в 5,2 раза (до 26), а минеральная система удобрения сокращает их только на среднеокультуренной почве. На этом фоне повышение степени окультуренности почвы и доз органических удобрений до высокого уровня неэффективно.Late blight is one of the most harmful potato diseases in the NorthWest of Russia. Today, its negative effects are aggravated by weather and climate changes. The goal of a comprehensive study carried out in the Menkovsky branch of the Agrophysical Institute in 2012 2017 was an assessment of the harmfulness of the late blight pathogen depending on soilagrochemical, weather and climate conditions. The methodical basis of the research was a prolonged field agrophysical stationary experiment in the system of field and vegetablefeed crop rotations, where potato was cultivated after winter rye and after barley, which, in turn, were grown after perennial grasses. The objects of the study were potato Lomonosovsky, sodpodzolic soil with different degree of cultivation and fertilizer systems for the culture. Potato Lomonosovsky is early ripening variety, its tubers are medium resistant to the late blight agent, and its tops are weakly resistant to it. The sodpodzolic soil had average, good and high cultivation degree. Sandy loam soil in the experiment had the value of pHKCl of 5.2 6.3, the humus content of 2.1 3.7, the content of mobile P2O5 and K2O compounds of 195 676, 97 298 mg/kg, respectively. In well and highly cultivated soils, these parameters were maintained by the application of 35 and 70 t/ha of organic fertilizers for potato, respectively. The experimental factors were the degree of soil cultivation (average, good and high) and the level of mineral fertilizer application for a given efficiency of photosynthetically active radiation (PAR efficiency of 1 3, without fertilizers PAR efficiency of 2 4, N80P20K100 PAR efficiency of 3 5, N120P30K150). In the course of the comprehensive study, the parameters of potato damage by late blight and the level of crop losses were established depending on the agroclimatic soilagrochemical conditions. Agronomic efficiency of the studied variants of the fertilizer system for potato was high. The level of tuber yield increase and payback of 1 kg of fertilizers active substances reached 33 58 and 8.3 11.6 cereal units (CU) for the mineral system, 25 45 and 3.9 8.0 CU for the organic one, and 33 79 and 3.8 6.7 CU for the organic and mineral fertilizer system. Under nonepiphytotic conditions (2 of 3 years of the observation), against the background of low and moderate damage rates, the total yield loss was 5, and the soil improvement and organic and mineral fertilizer application reduced them by 30 80. Against an epiphytotic background, repeated 1 time in 3 years, the damage of tops and potato tubers increases by a factor of 4.3 and 6.1, the intensity of the damage grew 2.8 and 3 times, and the development increases by a factor of 12 and 17.5 times, respectively. In the epiphytotic years, yield losses increased 5.2 times (up to 26), and the mineral fertilizer system reduced them only in medium cultured soil. Against this background, increasing the soil cultivation degree and organic fertilizer doses to a high level is ineffective.
* Коэффициент корреляции, обладающий степенью значимо сти, меньшей или равной 0,05 ** Коэффициент корреляции, обладающий степенью значимости, меньшей или равной 0,01
Представлены первые результаты выращивания десертных сортов винограда Виктория, Италия и Ред глоуб в теплице, накрытой полиэтиленовой пленкой, в условиях Южной Болгарии. Установлено, что фенофазы их развития начинаются раньше и протекают значительно более ускоренно по сравнению с их культивированием на открытом воздухе в полевых условиях. Ввиду вырастания достаточно длинных побегов виноградные кусты можно начать формировать ускоренно еще в первый вегетационный период. Виноград исследуемых сортов во второй и третий годы выращивания в теплице достигает потребительской зрелости приблизительно на месяц раньше по сравнению с виноградом, выращиваемым в полевых условиях, а урожай с одного куста возрастает с 25 кг на второй год до 710 кг на третий. Полученный виноград отличается очень хорошими, хозяйственно важными агробиологическими и технологическими показателями.The article summarizes first findings on cultivation of dessert grapevine cultivar Victoria, Italia and Red Gloube in the greenhouse covered with plastic wrap in the conditions of south Bulgaria. It has been established that phenophases of their development begin earlier, and proceed much more rapidly, as compared to cultivationin in the open air. Development of sufficiently long shoots allows shaping grapevine bushes at an early stage during the first vegetation period. In the second and third years of their cultivation in the greenhouse, the grapes of the studied cultivars reach consumer ripeness approximately one month earlier than the grapes grown in the field. The yield from one bush increases from 25 kg in the second year to 710 kg in the third. The grapes obtained demonstrated strong, economically significant agro-biological and technological characteristics.
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