Open Access Original Research Article

Effect of Different NPK Levels on the Growth and Yield of Three Tomato (Solanum lycopersicum) Varieties in Sri Lanka

H. A. S. L. Jayasinghe, L. M. H. R. Alwis, H. K. S. G. Gunadasa

Asian Research Journal of Agriculture, Page 1-6
DOI: 10.9734/ARJA/2016/29444

Experiments were conducted from June to August, 2016 in fields at Attampitiya and Walimada in Sri Lanka. The aim was to obtain growth and yield parameters of three tomato varieties under three levels of NPK fertilizers. Treatment consisted of two tomato varieties (Roma, Thilina, and T 245), five levels of NPK fertilizer (recommended dosage of inorganic fertilizers as a control dosage (T1), ½, ¾, 5/4 and 3/2 fold of the control treatment laid in a split-plot design with two replications. T-245 tomato variety proved superior over Roma and Thilina on growth characteristics. It was evident that increased NPK levels resulted in higher growth performance in all three tomato varieties. Elevated NPK level did not respond significantly to yield increase, implying that such additions are not necessary as they increase the cost of production in terms of high cost incurred for fertilizer and pollution.

Open Access Original Research Article

Effect of Phosphate Levels on Soil Rhizosphere Nutrient Balances and Finger Millet Yield

Wekha N. Wafula, Nicholas K. Korir, Henry F. Ojulong, Joseph P. Gweyi-Onyango

Asian Research Journal of Agriculture, Page 1-8
DOI: 10.9734/ARJA/2016/29606

Soil infertility is one of the main factors leading to low finger millet production in the semi-arid tropics of Kenya. About 50-80% of P applied as fertilizer is adsorbed by soil and the amount of P needed to achieve maintenance of its adequate status and influence on other soil properties has not been well documented. An on-station experiment was therefore conducted at the KALRO-Kiboko research station during the 2014 long and 2015 short rain seasons to investigate the influence of phosphorus rates on soil rhizosphere chemical properties and yield of three finger millet varieties. The experiment was laid out in a Randomized Complete Block Design in factorial arrangement and replicated three times. There were four P levels (0, 12.5, 25 and 37.5 kg ha-1 P2O5) and three varieties (U15, P-224 and local check-Kat FM1). Phosphorus application reduced the soil pH significantly for both seasons with the 37.5 kg ha-1 P2O5 rate eliciting the greatest pH from 9.26 to 7.90 (1.36 units) during the long rain season. As expected, soil phosphorus increased with the highest rate with 11 ppm during the long rain season and 9 ppm for the short rains. The organic carbon increased by 0.28% for the long rain season on the 25 kg ha-1 P2O5 rate while the highest rate increased total N by 0.05%. The 25 kg ha-1 P2O5 rate and U-15 indicated the highest yield for both seasons with a maximum of 3.71 t ha-1 realized during the short rain season. Monitoring change in soil nutrient status is important for prescribing P fertilization in order to maintain or replenish soil fertility. The application rate of 25 kg ha-1 P2O5 led to the optimal yields under the improved variety and hence the study recommends this rate.

Open Access Original Research Article

Planting Distance Effects on Mango-sweet Gourd Agroforestry System in the Mymensingh District of Bangladesh

I. Roy, M. R. Zaman, M. M. Rahman, M. A. Wadud, M. L. Alam

Asian Research Journal of Agriculture, Page 1-7
DOI: 10.9734/ARJA/2016/28907

Aims: To evaluate the growth performance of sweet gourd (Cucurbita moschata) under 3.5 years old Mango (Mangifera indicia L.) tree at planting different distances.

Study Design: The experiment was laid out following the Randomized Complete Block Design (RCBD) arrangement with three replications.

Place and Duration of Study: The experiment was conducted at the Kalibari char which is situated by the side of Brahmaputra River adjacent to the Bangladesh Agricultural University, Mymensingh, during the period of November 2013 to March 2014.

Methodology: The experiment consisted of five different treatments viz. T0 (sole sweet gourd and sole mango trees), T1 (Sweet gourd grown 0- 0.5 m distance from the tree), T2 (Sweet gourd grown 0.5- 1.0 m distance from the tree), T3 (Sweet gourd grown 1.0-1.5 m distance from the tree) and                T4 (Sweet gourd grown >1.5 m distance from the tree) and ten mango tree yield.

Results: The result showed that different morphological characteristics of sweet gourd were increased gradually with increasing distance from the tree base. The highest yield of sweet gourd was 25.8 t/ha obtained from treatment T0 (Sole sweet gourd). Among the different distances, the highest yield of sweet gourd was 23.7 t/ha in T4 (>1.5 m distances from the tree base) and the lowest was 16.2 t/ha in T1 (0-0.5 m distances from the tree base). On the other hand the best fruit yield of mango (8.6 t/ ha) was recorded in without sweet gourd association. In association with sweet gourd the fruit yield of mango was recorded (5.9 t/ha).

Conclusion: The yield of sweet gourd as a vegetable under sole cropping condition gives the best result in association with mango trees, the further the distance from the tree, the higher the yield of sweet gourd.

Open Access Original Research Article

Effect of Cow Manure on Growth, Yield and Nutrient Content of Mungbean

Syed Tarik Mahabub, Md. Shahjalal Hossain Khan, H. E. M. Khairul Mazed, Srabantika Sarker, Md. Hassan Tareque

Asian Research Journal of Agriculture, Page 1-6
DOI: 10.9734/ARJA/2016/29297

The experiment was conducted at the farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh during the period from March to June 2014 to study the effect of cowdung on the growth, yield and nutrient content of mungbean (Vigna radiata L.). The variety BARI Mung-5 was used as the test crop. The experiment consist of single factor: Cowdung (3 levels); C0: 0 ton cowdung ha-1 (control), C1: 5 ton cowdung ha-1 and C2: 10 ton cowdung   ha-1. The experiment was laid out in Randomized Complete Block Design (RCBD) with five replications. Data on different growth parameters and yield showed statistically significant variation for different levels of cowdung. The tallest plant, the highest number of leaves plant-1, the highest number of branches plant-1, the minimum number of days required for 1st flowering, the minimum number of days required for 80% pod maturity, the highest number of pods plant-1, the highest number of seeds pod-1, the longest pod, the maximum weight of 1000-seeds, the highest seed yield, the highest stover yield and nitrogen, phosphorus, potassium and sulphur content in seeds were recorded from 10 ton cowdung ha-1, whereas the lowest value was found from control treatment.

Open Access Original Research Article

Response of Wheat on Uptake, Protein and Nitrogen Use Efficiency to Application of Slow Releasing Nitrogen Fertilizer in Northern Ethiopia

Sofonyas Dargie, Lemma Wogi, Selamyihun Kidanu

Asian Research Journal of Agriculture, Page 1-8
DOI: 10.9734/ARJA/2016/29654

The N recovery by crops from the soluble N fertilizers such as urea is often as low as 30–40%, with a potentially high environmental cost associated with N losses via NH3 volatilization, NO3- leaching and N2O emission to the atmosphere. This study was initiated to evaluate the effects of slow releasing nitrogen fertilizer in nitrogen uptake, nitrogen use efficiency and grain protein content of wheat. A field experiment was carried out in 2015 main cropping season at Hawzien district in Tigray Regional State, Ethiopia. The experiment were arranged in a randomized complete block design with three replications at three farmer's field. Treatments were four levels of nitrogen (0, 32, 64 and 96) kg ha-1. The nitrogen source was UREAStabil, which is slow N releasing fertilizer. Conventional urea at recommended rate (64 kg N ha-1) was included as positive control at both sites. The highest grain and straw N uptake, and total uptake (41.81 kg ha-1, 24.28 kg ha-1, and 66.09 kg ha-1, respectively) were recorded for grain and straw harvested from plots treated with 64 kg N ha-1 in the form of UREAStabil . The highest agronomic efficiency of 9.46 kg kg-1and apparent recovery of nitrogen 55% was obtained at 64 kg N ha-1 as UREAStabil and physiological efficiency of 60.28 kg kg-1 was obtained at 64 kg N ha-1 as conventional urea. The highest and lowest grain protein content were recorded for grain harvested from plots fertilized with 96 kg N ha-1 (14.151%) in the form of UREAStabil and 0 kg N ha-1 (10.62%), respectively. It can be concluded that the highest uptake and nitrogen use efficiency was obtained on plots treated with UREAStabil than conventional urea.