نویسندگان
1 استادیار بخش تحقیقات خاک و آب، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی مازندران
2 استادیار بخش علوم زراعی و باغی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی مازندران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The aim of this research was to determine the role of optimum potassium fertilizer usage at phenological key stages of fruit growth in Miyagawa Satsuma mandarin in increasing the relative yield and fruit quality. To this end, potassium soil application (fertigation) and foliar application after fruit set, June drop, and cell expansion were evaluated in randomized complete block design with 5 treatments and 4 replications. Results showed that the highest yield, fruit average weight, and leaf potassium concentration was obtained from K fertigation after fruit set (middle of the first stage of fruit growth) and K foliar application after fruit set in cell expansion stage (second phase of fruit growth). All treatments significantly decreased fruits sunburn percent and increased fruit size and relative grade of fruit size, compared to the control. Potassium foliar application after fruit set and June drop had the maximum impact on relative increase of fruit diameter compared to the control and the percent of larger fruit increased relatively. Also, results showed that foliar application of potassium reduced the number of small fruits and increased medium and large fruits percentages. According to these results, it is recommended that potassium application as base fertilizer (before growth starts) be avoided and soil application begins after fruit set by fertigation; also, split foliar application of potassium nitrate should be done after fruit set and physiological fruit drop (June drop).
کلیدواژهها [English]