Optimization of NPK combination for seed production of onion (Allium cepa) crop

Abstract

Low productivity along with extensive usage of onion may cause shortage of this crop, as our country is facing high population problem. Mainly, there are two causes of low yield, lack of improved production technologies and poor quality of seed. Moreover, nutrient management is also an important aspect for getting higher yield. The current trial was conducted in RCBD with three replications and eight treatments. Treatments included different NPK fertilizer combinations i.e. T1: Control, T2: 30-20-00, T3: 60-40-15, T4: 90-60-30, T5: 120-80-45, T6: 150-100-60, T7: 180-120-75, T8: 210-140-90 kg NPK ha -1 and three replications. Data on multiple parameters viz. time to sprouting (days), number of shoots (plant -1 ), leaf length (cm), flowering stalk (plant -1 ), stalk length (cm), number of flowers (umbel -1 ), umbel diameter (cm), 1000-seed weight (g), seed yield (kg ha -1 ) were collected and statistically analyzed. It was noticed that increment of fertilizer rates delayed sprouting but increased the number of shoots, leaf length, flowering stalks, length of flowering stalks, flowers (umbel -1 ) and umbel diameter in onion cv. Shah Alam. Highest fertilizer dose (T8:210-140-90 kg NPK ha -1 ) showed its superiority by producing maximum shoots (6.48 plant -1 ), longest leaves (41.20 cm), longest flowering stalk (67.10 cm), flowers (372.22 umbel -1 ), umbel diameter (6.45 cm), seed weight (3.03 g) and seed yield (420.0 kg ha -1 ). But almost all these parameters were statistically similar with T7: 180-120-75 kg NPK ha -1 , hence, it is recommended that T7 and T8 should be used for getting maximum onion production.

Exploring the Therapeutic Potential of the Oxygenated Monoterpene Linalool in Alleviating Saline Stress Effects on Allium cepa L

“…Our data showed general negative relations between plant emergence and the concentration of most minerals in the different treatments of A. cepa, which differs from results previously found (Jilani et al 2019). The soil pH value of horizon A was not signi cantly correlated with emergence (Table 1).…”

Effects of NPS and Cattle Manure on Growth, Yield and Yield Components of Garlic (<i>Allium sativum L</i>.) at Guder, West Shewa Zone, Oromia, Ethiopia

“…Sulfur reported to improves the other major nutrient uptake of crops including garlic [14] As noted before, nitrogen is the major constituent of proteins and its abundant presence tends to increase the size of the leaves, which brings about an increase in carbohydrate synthesis [11]. The results of this study are in agreement with [44] and [32] who reported that the length and width of onion leaves increased with increased nitrogen rates. The results obtained in this experiment are generally in agreement with the findings of various Researchers where the application of NPS fertilizer alone or in combination increased the growth and development of garlic including the number, length and size of garlic leaves [5].…”

Mineral fertilizers for onions: a review

“…Иногда недостаточно убедительны. Однако не подлежат сомнению факт, что и азот, и фосфор активизируют физиологические процессы в тканях растительного организма, что безусловно, сказывается на вегетативных параметрах лука репчатого, которые можно оценить количественно [44,45,46,47,48]. Разница сведений связана с сортовыми различиями, почвенными и производственными условиями возделывания.…”

“…Увеличенная толщина шейки является физиологическим нарушением, в основном зависящим от времени года, места возделывания лука и его сорта, а не от наличия минеральных питательных веществ в почве [16]. В отчете [44] указано, что азот в дозе 200 кг/га увеличивал число луковиц с толстой шейкой. Другие авторы [37] отметили, что внесение азота и фосфора не влияло на образование луковиц с толстой шейкой.…”