Test status: please ensure that the mobile phone traffic
Test time: 60 minutes
Prepared by: xiaobian who took the college entrance examination in 2013
Below 60 points: you know, even the passing line did not reach, you should catch up with relevant knowledge.
60-80 points: you have a certain understanding of fertilization, but the knowledge you swallow makes it easy for you to make a wrong judgment at the critical moment. Please learn more, so as to effectively improve your fertilization skills
80-90 points: hey, good, you have a certain grasp of the basic knowledge, but there is room for improvement, and only persistent efforts will have good results.
90-100: wow, brother, you have a good grasp of basic knowledge, now check your judgment with practical action!
Keynote speaker: feng shuqiong
Co-founder/general manager of kunming lvdu fertilizer development co. LTD
President of yunnan youkelvdu agricultural research institute
Senior chemical engineer, senior plant nutritionist
Engaged in chemical products and fertilizer research and development for 28 years; Advocate and facilitator of the technical service model of biocontrol, disease resistance, soil modification, soil testing formula, target yield method, precise fertilization, integration of water and fertilizer and differentiation of smart agriculture; Nearly 20 years of professional technology and service experience in middle and high-end plant nutrition and soilless cultivation.
Main contents: soil, fertilizer, PH value in irrigation water, antagonism between elements, effect of fertilization method on nutrient element absorption imbalance.
The yucc green city lecture hall aims to improve the professional skills of technical personnel and their understanding of the agricultural environment through lectures, sharing and communication.
The third part of the lecture is the sharing training for store managers, clerks and technical service station staff of yunnan jincheng seed technology co., LTD.
The first yunnan wisdom agriculture development summit BBS award ceremony -- yuanmou service station
Yuke green all lecture hall lecture 3 - yuanmou jincheng seed experience center
A crop nutritionist at ucl
Distribute training materials to jincheng technicians
The content includes the following aspects:
I. schematic diagram of absorption efficiency of each nutrient element at different ph
What does a high PH mean? Elaborated from the following aspects:
In water: some nutrients or pesticides will decompose or react in small amounts after adding fertilizer or medicine, resulting in poor absorption effect. Does not absorb, causes in the soil to accumulate, the crop appears to be short of element symptom or excessive symptom.
In the soil and crops: N, potassium, iron, zinc, manganese, boron absorption is not good iron deficiency symptoms, high calcium and magnesium ions, phosphate fertilizer absorption and utilization rate is relatively high, also can appear aging phenomenon leaves do not open. Generally occurs in calcium - magnesium soil, clay easy to appear.
In fertilizer solution: causes excessive PH in fertilizer: crops appear nonabsorbent or have chemical reactions that cannot be mixed at all. Alkaline fertilizers are relatively few: diammonium phosphate is a weak alkaline fertilizer, mixed with other fertilizers is poor, there is a greater selectivity of water quality. So-called alkaline "potassium" fertilizer is mainly KOH or K2CO3.
In cultivation: it is easy to cause that the roots are always in the state of absorbing anions, and the vegetative growth of crops is greater than the reproductive growth.
Three, PH is too low what problem can appear.
Low PH: excessive acidity can easily cause soil hardening and lead to poisoning of trace elements, damage the living environment of soil microorganisms, reduce beneficial bacteria, accelerate nutrient loss, and make the soil lose the value of cultivation.
Generally occurs in the acidic red soil and the soil salinization serious. Acidic water is relatively less, such as groundwater is the quality of pyrite and contaminated water; Especially acidic fertilizers: calcium superphosphate, ammonium sulfate, etc.
Four, the discretion of PH why can appear be short of element symptom.
For example: iron deficiency yellowing
How to adjust PH value.
Including: water quality adjustment, fertilizer selection, soil adjustment, etc.
Five, antagonism problem.
Antagonism: when one ion exists, the absorption of another ion is inhibited called antagonism between ions.
Company employees share on the spot small experiments
Technician jin cheng observed the test results
6. Antagonistic results -- nitrogen fertilizer selection and excess cases, excess cases of elements, and salinization cases.
7.Effects of salt content in soil and irrigation water on crop growth.
ECe: conductivity of soil saturated solution
ECw: electrical conductivity of irrigation water
Percentage: degree of growth
When 100%, it means that the crop grows normally without salt damage.
90% means 10% salt damage to crop growth;
Zero percent means the crop dies and stops growing.
The Ec values of different crops are different!
For the same crop, the Ec values required in different nutrient periods are different.